如题所述
ï¼1ï¼2.64Ã1.7-2.64Ã0.7
=2.64Ãï¼1.7-0.7ï¼
=2.64Ã1
=2.64
ï¼2ï¼31.5Ã1.07-3.15Ã0.7
=3.15Ã10.7-3.15Ã0.7
=3.15Ãï¼10.7-0.7ï¼
=3.15Ã10
=31.5
ï¼3ï¼2.7Ã5.7-2.7+5.3Ã2.7
=2.7Ã(5.7-1+5.3ï¼
=2.7Ã10
=27
ï¼4ï¼0.625÷0.125Ã0.8
=ï¼0.625Ã0.8ï¼Ã8÷ï¼0.128Ã8ï¼
=0.5Ã8÷1
=4
ï¼5ï¼18.6Ã6.1+3.9Ã18.6
=18.6Ãï¼6.1+3.9ï¼
=18.6Ã10
=186
ï¼6ï¼1.3579+3.5791+5.7913+7.9135+9.1357
=ï¼1+3+5+7+9ï¼Ã1.1111
=25Ã1.1111
=27.7775
ï¼7ï¼52.5x2.9+5.45
=5.25x29+5.25+0.2
=5.25Ãï¼29+1ï¼+0.2
=5.25Ã30+0.2
=157.5+0.3
=157.7
ï¼8ï¼0.92x15+0.08x15
=ï¼0.92+0.08ï¼Ã15
=1Ã15
=15
ï¼9ï¼0.72Ã1.25Ã2.5
=0.9Ãï¼0.8Ã1.25ï¼Ã2.5
=0.9Ã1Ã2.5
=2.25
ï¼10ï¼400.6x7-2003x0.4
=200.3x14-200.3x4
=200.3Ãï¼14-4ï¼
=200.3Ã10
=2003
=2.64Ãï¼1.7-0.7ï¼
=2.64Ã1
=2.64
ï¼2ï¼31.5Ã1.07-3.15Ã0.7
=3.15Ã10.7-3.15Ã0.7
=3.15Ãï¼10.7-0.7ï¼
=3.15Ã10
=31.5
ï¼3ï¼2.7Ã5.7-2.7+5.3Ã2.7
=2.7Ã(5.7-1+5.3ï¼
=2.7Ã10
=27
ï¼4ï¼0.625÷0.125Ã0.8
=ï¼0.625Ã0.8ï¼Ã8÷ï¼0.128Ã8ï¼
=0.5Ã8÷1
=4
ï¼5ï¼18.6Ã6.1+3.9Ã18.6
=18.6Ãï¼6.1+3.9ï¼
=18.6Ã10
=186
ï¼6ï¼1.3579+3.5791+5.7913+7.9135+9.1357
=ï¼1+3+5+7+9ï¼Ã1.1111
=25Ã1.1111
=27.7775
ï¼7ï¼52.5x2.9+5.45
=5.25x29+5.25+0.2
=5.25Ãï¼29+1ï¼+0.2
=5.25Ã30+0.2
=157.5+0.3
=157.7
ï¼8ï¼0.92x15+0.08x15
=ï¼0.92+0.08ï¼Ã15
=1Ã15
=15
ï¼9ï¼0.72Ã1.25Ã2.5
=0.9Ãï¼0.8Ã1.25ï¼Ã2.5
=0.9Ã1Ã2.5
=2.25
ï¼10ï¼400.6x7-2003x0.4
=200.3x14-200.3x4
=200.3Ãï¼14-4ï¼
=200.3Ã10
=2003
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第1个回答 2019-08-11
0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100
=1000
1.25×(8+10)
=1.25×8+1.25×10
=10+12.5=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3=24.9
9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999
14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
8.3×(6.3+3.7)
=8.3×10
=83
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
=933-(157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
I32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000
9048÷268
=(2600+2600+2600+1248)÷26
=2600÷26+2600÷26+2600÷26+1248÷269
=100+100+100+48
=348
=(0.4×25)×(125×0.8)
=10×100
=1000
1.25×(8+10)
=1.25×8+1.25×10
=10+12.5=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3=24.9
9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999
14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
8.3×(6.3+3.7)
=8.3×10
=83
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
=933-(157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
I32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000
9048÷268
=(2600+2600+2600+1248)÷26
=2600÷26+2600÷26+2600÷26+1248÷269
=100+100+100+48
=348
第2个回答 2020-01-17
六年级数学简便计算练习题
二、用简便方法计算下面各题。(90分,4×20+5×2)
1125-997 998+1246 4+3.2+5+6.8 12-(1+2) 400÷125÷8 25×(37×8)
(-)×12 1×2× 34×(2+) 125×8.8 4.35+4.25+3.65+3.75 3.4×99+3.4
17.15-8.47-1.53 17-3-4 ÷2+× 0.125×0.25×32 22.3-2.45-5.3-4.55
(++)×72 4.25-3-(2-1) 187.7×11-187.7 43×+57.125×-0.5 ×(-÷)
2.42÷+4.58×-4÷3 ×6.6+2.5× -- 4.6+++5.4 2.8++7.2+ -(+)
+2.25++ ++ -+ +-++ 0.75+++0.375 5--
++++ 48.3-- ×4.25+÷6 0.625×0.5++×62.5% ×÷ +(-1.8)
2.5×(+++) 22×+25×75%-7×0.75 0.25×63.5-× ×2.5-× +3.125++ 1125-996
(111+999) ÷[56×(-)] 49.5×-(50-)×0.6 ×+÷+ 45×(+-0.6) 897×-37.5%+104×0.375
×(-5.375) 3.5×+1.25×+3.8÷ 71×99 3755+2996 8439+1001 446+295 888+999
72×156-56×72 25×32×125 709×99+709 14. 0.25×48 2.5×0.4×2 299×101 563×999
2×6.6+2.5×6 75.3×99+75.3 4.6×3.7+54×0.37 0.125×+×8.25+12.5% 8.37-3.25-(1.37+1.75) 2100÷20
11―6―1 15―4.25―5 19.82―6.57―3.43 4.6+3+6+5.4 4+2.25+5+7 9.63÷2.5÷4 6÷0.25
3-- ×+× ×+÷ 18×(+) ×7+×5 (-)×(24-)
(×+)÷ ÷[(+)×] ×7+×5 (-)×24-) (×+)÷ ÷[(+)×]
(32×+17)÷ (25+)÷+ ×+×+ (21×+×21)× (99+)÷9 ×÷
÷[(+)×] (+)×30 +3÷ ×-÷ 4-- ×58+×41+
××- ×+÷ ÷[(-)÷] 235 - 135÷18 ×153 – 0.6×53 (+)÷+
10 - - + 25×÷× 13.09-8.12-4.88 12×103-4500÷75 ×[÷(×)] (+)×15×11
二、用简便方法计算下面各题。(90分,4×20+5×2)
1125-997 998+1246 4+3.2+5+6.8 12-(1+2) 400÷125÷8 25×(37×8)
(-)×12 1×2× 34×(2+) 125×8.8 4.35+4.25+3.65+3.75 3.4×99+3.4
17.15-8.47-1.53 17-3-4 ÷2+× 0.125×0.25×32 22.3-2.45-5.3-4.55
(++)×72 4.25-3-(2-1) 187.7×11-187.7 43×+57.125×-0.5 ×(-÷)
2.42÷+4.58×-4÷3 ×6.6+2.5× -- 4.6+++5.4 2.8++7.2+ -(+)
+2.25++ ++ -+ +-++ 0.75+++0.375 5--
++++ 48.3-- ×4.25+÷6 0.625×0.5++×62.5% ×÷ +(-1.8)
2.5×(+++) 22×+25×75%-7×0.75 0.25×63.5-× ×2.5-× +3.125++ 1125-996
(111+999) ÷[56×(-)] 49.5×-(50-)×0.6 ×+÷+ 45×(+-0.6) 897×-37.5%+104×0.375
×(-5.375) 3.5×+1.25×+3.8÷ 71×99 3755+2996 8439+1001 446+295 888+999
72×156-56×72 25×32×125 709×99+709 14. 0.25×48 2.5×0.4×2 299×101 563×999
2×6.6+2.5×6 75.3×99+75.3 4.6×3.7+54×0.37 0.125×+×8.25+12.5% 8.37-3.25-(1.37+1.75) 2100÷20
11―6―1 15―4.25―5 19.82―6.57―3.43 4.6+3+6+5.4 4+2.25+5+7 9.63÷2.5÷4 6÷0.25
3-- ×+× ×+÷ 18×(+) ×7+×5 (-)×(24-)
(×+)÷ ÷[(+)×] ×7+×5 (-)×24-) (×+)÷ ÷[(+)×]
(32×+17)÷ (25+)÷+ ×+×+ (21×+×21)× (99+)÷9 ×÷
÷[(+)×] (+)×30 +3÷ ×-÷ 4-- ×58+×41+
××- ×+÷ ÷[(-)÷] 235 - 135÷18 ×153 – 0.6×53 (+)÷+
10 - - + 25×÷× 13.09-8.12-4.88 12×103-4500÷75 ×[÷(×)] (+)×15×11
第3个回答 2020-01-27
1+2+4+8+16+32+64+128+256
=256*2-1
=512-1
=511
9999*7777+3333*6666
=(1111*9)*(1111*7)+(1111*3)*(1111*6)
=1111*(9*7+3*6)
=89991
=256*2-1
=512-1
=511
9999*7777+3333*6666
=(1111*9)*(1111*7)+(1111*3)*(1111*6)
=1111*(9*7+3*6)
=89991
第4个回答 2019-02-12
1/3+1/4=7/12