像 (-9)-(-13)+(-20)+(-2) 之类的。
越多越好 前提是一定要有答案!!并且答案一定要正确!!没有答案请不要发!
有理数的混合运算练习题
一.选择题
1. 计算 (B )
A.1000 B.-1000 C.30 D.-30
2. 计算 ( A )
A.0 B.-54 C.-72 D.-18
3. 计算 (B )
A.1 B.25 C.-5 D.35
4. 下列式子中正确的是(C )
A. B.
C. D.
5. 的结果是(B )
A.4 B.-4 C.2 D.-2
6. 如果 ,那么 的值是(A )
A.-2 B.-3 C.-4 D.4
二.填空题
1.有理数的运算顺序是先算乘方,再算乘除,最算加减;如果有括号,那么先算括号内。
2.一个数的101次幂是负数,则这个数是负数 。
3. -12。
4. -3 。
5. -6 。
6. 1 。
7. ― 。
8. -25 。
三.计算题
有理数加法
(-9)+(-13) (-12)+27 (-28)+(-34)
=-22 =15 =-62
67+(-92) (-27.8)+43.9 (-23)+7+(-152)+65
=-25 =16.1 =-103
原则一:所有正数求和,所有负数求和,最后计算两个数的差,取绝对值较大的数的符号。
| +(- )| = (- )+|― | =- 38+(-22)+(+62)+(-78)=0
(-8)+(-10)+2+(-1) (- )+0+(+ )+(- )+(- )
=-17 =-
(-8)+47+18+(-27) (-5)+21+(-95)+29
=30 =-50
(-8.25)+8.25+(-0.25)+(-5.75)+(-7.5) 6+(-7)+(-9)+2
=-13.5 =-8
原则二:凑整,0.25+0.75=1 + =1 0.25+ =1
72+65+(-105)+(-28) (-23)+|-63|+|-37|+(-77)
=4 =0
19+(-195)+47 (+18)+(-32)+(-16)+(+26)
=-129 =-4
(-0.8)+(-1.2)+(-0.6)+(-2.4) (-8)+(-3 )+2+(- )+12
=-5 =2
5 +(-5 )+4 +(- ) (-6.37)+(-3 )+6.37+2.75
=4 =-1
原则二:凑整,0.25+0.75=1 + =1 0.25+ =1 抵消:和为零
有理数减法
7-9 ―7―9 0-(-9) (-25)-(-13)
=-2 =-16 =9 =-12
8.2―(―6.3) (-3 )-5 (-12.5)-(-7.5)
=14.5 =-8 =-5
(-26)―(-12)―12―18 ―1―(- )―(+ ) (- )―(- )―
=-44 =-2 =
(-20)-(+5)-(-5)-(-12) (-23)―(-59)―(-3.5) |-32|―(-12)―72―(-5)
=-8 =39.5 =-23
(+ )―(- )―(- )― (- )―3―(-3.2)―7 (+ )―(- )―
=― =-10 =0
(-0.5)-(-3 )+6.75-5 (+6.1)―(-4.3)―(-2.1)―5.1
=4 =7.4
(- )―(-1 )―(-1 )―(+1.75) (-3 )―(-2 )―(-1 )―(-1.75)
=1 =2.5
-8 -5 +4 -3 -4 + +(- )―
=-13 =-7
0.5+(- )-(-2.75)+ (+4.3)-(-4)+(-2.3)-(+4)
=3.5 =2
原则三:结果的形式要与题目中数的形式保持一致。如确定是分数还是小数,分数必须是带分数或真分数,不得是假分数,过程中无所谓。
有理数乘法
(-9)× (- )×(-0.26) (-2)×31×(-0.5)
=-6 =0.04 =31
×(-5)+ ×(-13) (-4)×(-10)×0.5×(-3) (- )× ×(-1.8)
=-6 =-60 =0.9
(-0.25)×(- )×4×(-7) (- )×(- )×(- )
=-4 =-
(-8)×4×(- )×(-0.75) 4×(-96)×(-0.25)×
=-12 =2
( -1 + )×56 ( ― ― )×36
=32—63+12 =30—27—28
=19 =-25
(- )×(8- -0.4) (-66)×〔1 -(- )+(- )〕
=-6+1+0.3 =-66-63-22+55
=-4.7 =-96
25× -(-25)× +25× (-36)×( + - )
=25×( + + ) =-16-30+21
=25×1 =-25
=37
原则四:巧妙运用运算律
( + - + )×72 ×(2 - )×(- )×(- )
=28+54-60+56 = ×( )×(- )×(- )
=78 =
有理数除法
18÷(-3) (-24)÷6 (-57)÷(-3) (- )÷ (-42)÷(-6)
= -6 =-4 =19 =- =7
(+ )÷(- ) (- )÷9 0.25÷(- ) -36÷(-1 )÷(- )
=- = - =-2 =-40
(-1)÷(-4)÷ 3÷(- )×(- ) 0÷[(-3 )×(-7)]
= = =0
-3÷( - ) (-24 )÷(-6) 2÷(5-18)×
=-36 =4 =-
1 ÷(-3)×(- ) - ×(- )÷(- ) ( - )÷(- )
= =- =
( - + )÷(- ) -3.5 ×( -0.5)× ÷ -1 ÷(-1 )×1 ×(-7)
=-6+ -1 =- ×(- )× ×2 =- × × ×7
=-6 =1 =-
=-6
×(- - )÷ ÷(-2 )- × - ÷4
=- × × = ×(- )- × - ×
=-4 =- ×( + +1 )
=- ×
=-1
原则三:结果的形式要与题目中数的形式保持一致。如确定是分数还是小数,分数必须是带分数或真分数,不得是假分数,过程中无所谓。
0.8× +4.8×(- )-2.2÷ +0.8×
=0.8×( + )- × - ×
= - - =- -
=- -5 =- -5
=-5
有理数混合运算
(- )×(-15×4) (-2.4)
=10+9-48+35 =
=6
2÷(- )× ÷(-5 ) [15 -(1 ÷1 +3 )]÷(-1 )
= =[15 - × -3 ]× =[12- × ]×
= × =
=9
×(-5)÷(- )×5 -( - + - )÷(- )
=25 =( - + - )×42
=14-2+9-12=9
-13× -0.34× + ×(-13)- ×0.34 8-(-25)÷(-5)
=[-13× + ×(-13)]-0.34× - ×0.34 =3
=-13-0.34=-13.34
(-13)×(-134)× ×(- ) (-4 )-(-5 )+(-4 )-3
=-2 =-8+1 =-6
(-16-50+3 )÷(-2) (-0.5)-(-3 )+6.75-5
=8+25-1 =(-0.5)-5 +6.75-(-3.25)
=31 =4
178-87.21+43 +53 -12.79 (-6)×(-4)+(-32)÷(-8)-3
=178-87.21-12.79+43 +53 =24+4-3
=178-100+97 =25
=175
- -(- )+|-1 | (-9)×(-4)+ (-60)÷12
=1 =36-6=31
[(- )-1 + ]÷(- ) -|-3|÷10-(-15)× - ×(8-2 -0.04)
=[- - + ]×(-42) =- +5 =-6+ +0.03=-6+1.75+0.03
=27+72-16=83 =4 =-4.22
-1 ×( - )÷2 (2 -3 +1 )÷(-1 )×(-7)
=- ×(- )× =( - + )×(- )×(-7)
= =( - + )×6
=14-21+ =4
有乘方的运算:
-2× - - - -2× ÷
=-18 =-3 =17 =-1+2=1 =9÷16=
× + × × × -
=- =-68 = = =4096 = × ×
=-6×9=-54
+ + - × - - +
=2 =-4-27+1 =- +
=-30 =0
0- ÷3× × ÷ - × - ÷
=24 =4× × =1 =-1+32=31
×(- +1) ×0 6+ × -10+8÷ -4×3
=0 =5 =-20
- - -(1-0.5)× × ×
=-1-1=-2 =-1- =-1 =-4
4× +6 × × × - +2× +(-6)÷
=42 = =-49+18-54=-97
÷(-8)- ×(- ) ×( )×
=-2- =-2 =0
-2[ -3× ]÷ ÷9÷ 36×
=4+4×5=24 =9 =1
-{ } - +(1-0.5)× ×[2× ]
=-{-27-3.3}=30.3 =-1+3=2
-4× + - - + × ÷
=4+16=20 =-27+2-18=-43
过关测试:
1. 2.
=-18 =-
3. 4.
=0 =-23
5. 6.
=4 =3
7. 8.
=-8 =-45
9. 10.
=-28 =1
11. 12.
=8+25-1 =-48+8-80
=31 =-120
13. 14.
=- =-1
15. 16.
=9 =
17. 18.
=-1+ =81× × ×
= =1
19. 20.
=-25-[-4- ] =(-5-7+12) ×(-3 )
=-20 =0
21. 22.
=-10-80 =9- -9
=-90 =-
计算过程要做到:
1、能心算的不用写出来;
2、在草稿纸上按顺序标清题号,若能直接出结果的,则在此题号上画卷,如3;3、不能直接出结果的,打草稿要规范,以便检查时查对,节省时间;
4、做计算题要耐心,不能烦躁。
5、平时记忆需积累的:
1-10 的数的立方;
1-20的平方;
100以内,和为100 的两个数的熟悉程度;
125找8 25找4 5找2凑整分别为1000 100 10;
放到小数范围内的推广使用。
一.选择题
1. 计算 (B )
A.1000 B.-1000 C.30 D.-30
2. 计算 ( A )
A.0 B.-54 C.-72 D.-18
3. 计算 (B )
A.1 B.25 C.-5 D.35
4. 下列式子中正确的是(C )
A. B.
C. D.
5. 的结果是(B )
A.4 B.-4 C.2 D.-2
6. 如果 ,那么 的值是(A )
A.-2 B.-3 C.-4 D.4
二.填空题
1.有理数的运算顺序是先算乘方,再算乘除,最算加减;如果有括号,那么先算括号内。
2.一个数的101次幂是负数,则这个数是负数 。
3. -12。
4. -3 。
5. -6 。
6. 1 。
7. ― 。
8. -25 。
三.计算题
有理数加法
(-9)+(-13) (-12)+27 (-28)+(-34)
=-22 =15 =-62
67+(-92) (-27.8)+43.9 (-23)+7+(-152)+65
=-25 =16.1 =-103
原则一:所有正数求和,所有负数求和,最后计算两个数的差,取绝对值较大的数的符号。
| +(- )| = (- )+|― | =- 38+(-22)+(+62)+(-78)=0
(-8)+(-10)+2+(-1) (- )+0+(+ )+(- )+(- )
=-17 =-
(-8)+47+18+(-27) (-5)+21+(-95)+29
=30 =-50
(-8.25)+8.25+(-0.25)+(-5.75)+(-7.5) 6+(-7)+(-9)+2
=-13.5 =-8
原则二:凑整,0.25+0.75=1 + =1 0.25+ =1
72+65+(-105)+(-28) (-23)+|-63|+|-37|+(-77)
=4 =0
19+(-195)+47 (+18)+(-32)+(-16)+(+26)
=-129 =-4
(-0.8)+(-1.2)+(-0.6)+(-2.4) (-8)+(-3 )+2+(- )+12
=-5 =2
5 +(-5 )+4 +(- ) (-6.37)+(-3 )+6.37+2.75
=4 =-1
原则二:凑整,0.25+0.75=1 + =1 0.25+ =1 抵消:和为零
有理数减法
7-9 ―7―9 0-(-9) (-25)-(-13)
=-2 =-16 =9 =-12
8.2―(―6.3) (-3 )-5 (-12.5)-(-7.5)
=14.5 =-8 =-5
(-26)―(-12)―12―18 ―1―(- )―(+ ) (- )―(- )―
=-44 =-2 =
(-20)-(+5)-(-5)-(-12) (-23)―(-59)―(-3.5) |-32|―(-12)―72―(-5)
=-8 =39.5 =-23
(+ )―(- )―(- )― (- )―3―(-3.2)―7 (+ )―(- )―
=― =-10 =0
(-0.5)-(-3 )+6.75-5 (+6.1)―(-4.3)―(-2.1)―5.1
=4 =7.4
(- )―(-1 )―(-1 )―(+1.75) (-3 )―(-2 )―(-1 )―(-1.75)
=1 =2.5
-8 -5 +4 -3 -4 + +(- )―
=-13 =-7
0.5+(- )-(-2.75)+ (+4.3)-(-4)+(-2.3)-(+4)
=3.5 =2
原则三:结果的形式要与题目中数的形式保持一致。如确定是分数还是小数,分数必须是带分数或真分数,不得是假分数,过程中无所谓。
有理数乘法
(-9)× (- )×(-0.26) (-2)×31×(-0.5)
=-6 =0.04 =31
×(-5)+ ×(-13) (-4)×(-10)×0.5×(-3) (- )× ×(-1.8)
=-6 =-60 =0.9
(-0.25)×(- )×4×(-7) (- )×(- )×(- )
=-4 =-
(-8)×4×(- )×(-0.75) 4×(-96)×(-0.25)×
=-12 =2
( -1 + )×56 ( ― ― )×36
=32—63+12 =30—27—28
=19 =-25
(- )×(8- -0.4) (-66)×〔1 -(- )+(- )〕
=-6+1+0.3 =-66-63-22+55
=-4.7 =-96
25× -(-25)× +25× (-36)×( + - )
=25×( + + ) =-16-30+21
=25×1 =-25
=37
原则四:巧妙运用运算律
( + - + )×72 ×(2 - )×(- )×(- )
=28+54-60+56 = ×( )×(- )×(- )
=78 =
有理数除法
18÷(-3) (-24)÷6 (-57)÷(-3) (- )÷ (-42)÷(-6)
= -6 =-4 =19 =- =7
(+ )÷(- ) (- )÷9 0.25÷(- ) -36÷(-1 )÷(- )
=- = - =-2 =-40
(-1)÷(-4)÷ 3÷(- )×(- ) 0÷[(-3 )×(-7)]
= = =0
-3÷( - ) (-24 )÷(-6) 2÷(5-18)×
=-36 =4 =-
1 ÷(-3)×(- ) - ×(- )÷(- ) ( - )÷(- )
= =- =
( - + )÷(- ) -3.5 ×( -0.5)× ÷ -1 ÷(-1 )×1 ×(-7)
=-6+ -1 =- ×(- )× ×2 =- × × ×7
=-6 =1 =-
=-6
×(- - )÷ ÷(-2 )- × - ÷4
=- × × = ×(- )- × - ×
=-4 =- ×( + +1 )
=- ×
=-1
原则三:结果的形式要与题目中数的形式保持一致。如确定是分数还是小数,分数必须是带分数或真分数,不得是假分数,过程中无所谓。
0.8× +4.8×(- )-2.2÷ +0.8×
=0.8×( + )- × - ×
= - - =- -
=- -5 =- -5
=-5
有理数混合运算
(- )×(-15×4) (-2.4)
=10+9-48+35 =
=6
2÷(- )× ÷(-5 ) [15 -(1 ÷1 +3 )]÷(-1 )
= =[15 - × -3 ]× =[12- × ]×
= × =
=9
×(-5)÷(- )×5 -( - + - )÷(- )
=25 =( - + - )×42
=14-2+9-12=9
-13× -0.34× + ×(-13)- ×0.34 8-(-25)÷(-5)
=[-13× + ×(-13)]-0.34× - ×0.34 =3
=-13-0.34=-13.34
(-13)×(-134)× ×(- ) (-4 )-(-5 )+(-4 )-3
=-2 =-8+1 =-6
(-16-50+3 )÷(-2) (-0.5)-(-3 )+6.75-5
=8+25-1 =(-0.5)-5 +6.75-(-3.25)
=31 =4
178-87.21+43 +53 -12.79 (-6)×(-4)+(-32)÷(-8)-3
=178-87.21-12.79+43 +53 =24+4-3
=178-100+97 =25
=175
- -(- )+|-1 | (-9)×(-4)+ (-60)÷12
=1 =36-6=31
[(- )-1 + ]÷(- ) -|-3|÷10-(-15)× - ×(8-2 -0.04)
=[- - + ]×(-42) =- +5 =-6+ +0.03=-6+1.75+0.03
=27+72-16=83 =4 =-4.22
-1 ×( - )÷2 (2 -3 +1 )÷(-1 )×(-7)
=- ×(- )× =( - + )×(- )×(-7)
= =( - + )×6
=14-21+ =4
有乘方的运算:
-2× - - - -2× ÷
=-18 =-3 =17 =-1+2=1 =9÷16=
× + × × × -
=- =-68 = = =4096 = × ×
=-6×9=-54
+ + - × - - +
=2 =-4-27+1 =- +
=-30 =0
0- ÷3× × ÷ - × - ÷
=24 =4× × =1 =-1+32=31
×(- +1) ×0 6+ × -10+8÷ -4×3
=0 =5 =-20
- - -(1-0.5)× × ×
=-1-1=-2 =-1- =-1 =-4
4× +6 × × × - +2× +(-6)÷
=42 = =-49+18-54=-97
÷(-8)- ×(- ) ×( )×
=-2- =-2 =0
-2[ -3× ]÷ ÷9÷ 36×
=4+4×5=24 =9 =1
-{ } - +(1-0.5)× ×[2× ]
=-{-27-3.3}=30.3 =-1+3=2
-4× + - - + × ÷
=4+16=20 =-27+2-18=-43
过关测试:
1. 2.
=-18 =-
3. 4.
=0 =-23
5. 6.
=4 =3
7. 8.
=-8 =-45
9. 10.
=-28 =1
11. 12.
=8+25-1 =-48+8-80
=31 =-120
13. 14.
=- =-1
15. 16.
=9 =
17. 18.
=-1+ =81× × ×
= =1
19. 20.
=-25-[-4- ] =(-5-7+12) ×(-3 )
=-20 =0
21. 22.
=-10-80 =9- -9
=-90 =-
计算过程要做到:
1、能心算的不用写出来;
2、在草稿纸上按顺序标清题号,若能直接出结果的,则在此题号上画卷,如3;3、不能直接出结果的,打草稿要规范,以便检查时查对,节省时间;
4、做计算题要耐心,不能烦躁。
5、平时记忆需积累的:
1-10 的数的立方;
1-20的平方;
100以内,和为100 的两个数的熟悉程度;
125找8 25找4 5找2凑整分别为1000 100 10;
放到小数范围内的推广使用。
温馨提示:答案为网友推荐,仅供参考
第1个回答 2012-09-23
(-9)-(-13)+(-20)+(-2)
=4+(-20)+(-2)
=(-16)+(-2)
=-18
=4+(-20)+(-2)
=(-16)+(-2)
=-18
第2个回答 推荐于2017-11-25
题目中的我就不写了。。。
(-8)+23+2+(-5)
=15+2+(-5)
=17+(-5)
=12
(-3)-(-3)+(-2)+4
=(-3)+3-2+4
=0-2+4
=(-2)+4
=2
(-4)+(-2)+(-4)-(+2)
=(-6)+(-4)-(+2)
=(-10)-(+2)
=(-10)-2
=-12
之类的还有很多。。。我就不写了啊,LZ要是想要,下次我再弄点追问
(-8)+23+2+(-5)
=15+2+(-5)
=17+(-5)
=12
(-3)-(-3)+(-2)+4
=(-3)+3-2+4
=0-2+4
=(-2)+4
=2
(-4)+(-2)+(-4)-(+2)
=(-6)+(-4)-(+2)
=(-10)-(+2)
=(-10)-2
=-12
之类的还有很多。。。我就不写了啊,LZ要是想要,下次我再弄点追问
敢问高人哪里弄得,这么少我完全不够啊!难不成自己写的?
追答尊的是自己写的、、呵呵,写多了
LZ还要么?
第3个回答 2012-09-24
建议你百度一下 初中数学789 那里就有你所需的初一上册数学有理数运算练习题及答案,