初一50道数学计算题+答案带答案
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1.éæ©é¢ï¼
(1)æ-2-(+3)-(-5)+(-4)+(+3)åæçç¥æ¬å·åçå½¢å¼ï¼æ£ç¡®çæ¯( )
A.-2-3-5-4+3 B.-2+3+5-4+3 C.-2-3+5-4+3 D.-2-3-5+4+3
(2)计ç®(-5)-(+3)+(-9)-(-7)+ æå¾ç»ææ£ç¡®çæ¯( )
A.-10 B.-9 C.8 D.-23
(3)-7ï¼-12ï¼+2ç代æ°åæ¯å®ä»¬çç»å¯¹å¼çåå°( )
A.-38 B.-4 C.4 D.38
(4)è¥ +(b+3)2=0,åb-a- çå¼æ¯( )
A.-4 B.-2 C.-1 D.1
(5)ä¸å说æ³æ£ç¡®çæ¯( )
A.两个è´æ°ç¸åï¼çäºç»å¯¹å¼ç¸å B.两个è´æ°çå·®ä¸å®å¤§äºé¶ C.æ£æ°åå»è´æ°ï¼å®é æ¯ä¸¤ä¸ªæ£æ°ç代æ°å D.è´æ°åå»æ£æ°ï¼çäºè´æ°å ä¸æ£æ°çç»å¯¹å¼
(6)ç®å¼-3-5ä¸è½è¯»ä½( )
A.-3ä¸5çå·® B.-3ä¸-5çå C.-3ä¸-5çå·® D.-3åå»5
2.填空é¢ï¼(4â²Ã4=16â²)
(1)-4+7-9=- - + ;
(2)6-11+4+2=- + - + ;
(3)(-5)+(+8)-(+2)-(-3)= + - + ;
(4)5-(-3 )-(+7)-2 =5+ - - + - .
3.æä¸ååå¼åæçç¥æ¬å·çåçå½¢å¼ï¼å¹¶è¯´åºå®ä»¬ç两ç§è¯»æ³ï¼(8â²Ã2=16â²)
(1)(-21)+(+16)-(-13)-(+7)+(-6);
(2)-2 -(- )+(-0.5)+(+2)-(+ )-2.
4.计ç®é¢(6â²Ã4=24â²)
(1)-1+2-3+4-5+6-7;
(2)-50-28+(-24)-(-22);
(3)-19.8-(-20.3)-(+20.2)-10.8;
(4)0.25- +(-1 )-(+3 ).
5.å½x=-3.7,y=-1.8,z=-1.5æ¶,æ±ä¸å代æ°å¼çå¼(5â²Ã4=20â²)
(1)x+y-z;
(2)-x-y+z;
(3)-x+y+z;
(4)x-y-z.
åä¸æ°å¦è®¡ç®é¢å¤§å ¨åçæ¡ãç´ è´¨ä¼åè®ç»ã
(1) (-7)-(+5)+(+3)-(-9)=-7 5 3 9;
(2)-(+2 )-(-1 )-(+3 )+(- ) =( 2 )+( 1 )+( 3 )+( );
(3)-14 5 (-3)=-12;
(4)-12 (-7) (-5) (-6)=-16;
(5)b-a-(+c)+(-d)= a b c d;
2.å½x= ,y=- ,z=- æ¶,åå«æ±åºä¸å代æ°å¼çå¼;
(1)x-(-y)+(-z);
(2)x+(-y)-(+z);
(3)-(-x)-y+z;
(4)-x-(-y)+z.
3.å°±ä¸åç»çä¸ç»æ°,éªè¯çå¼ï¼ a-(b-c+d)=a-b+c-dæ¯å¦æç«.
(1)a=-2,b=-1,c=3,d=5; (2)a=23 ,b=-8,c=-1 ,d=1 .
4.计ç®é¢
(1)-1-23.33-(+76.76);
(2)1-2*2*2*2;
(3)(-6-24.3)-(-12+9.1)+(0-2.1);
(4)-1+8-7
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1.(1)C;(2)B;(3)D;(4)A;(5)C;(6)C 2.(1)4,(-7),(-9) (2)(-6),(-11),(-4),2; (3)-5,8,2,3; (4)3,7,2; 3.ç¥4.(1)-4; (2)-80; (3)-30.5 (4)-5 5.(1)-4; (2)4; (3)0.4; (4)-0.4.
ãç´ è´¨ä¼åè®ç»ã 1.(1)-,+,+; (2)-,+,-,-; (3)+,+; (4)-,+,+; (5)-,+,-,-. 2.(1) (2) (3) (4)- 3.(1) (2)é½æç«. 4.(1)- (2) (3)-29.5 (4)-1 第(4)é¢æ³¨æåå·çæ°ãäºä¸ºç¸åæ°å åå«ç»åã
1.éæ©é¢ï¼
(1)æ-2-(+3)-(-5)+(-4)+(+3)åæçç¥æ¬å·åçå½¢å¼ï¼æ£ç¡®çæ¯( )
A.-2-3-5-4+3 B.-2+3+5-4+3 C.-2-3+5-4+3 D.-2-3-5+4+3
(2)计ç®(-5)-(+3)+(-9)-(-7)+ æå¾ç»ææ£ç¡®çæ¯( )
A.-10 B.-9 C.8 D.-23
(3)-7ï¼-12ï¼+2ç代æ°åæ¯å®ä»¬çç»å¯¹å¼çåå°( )
A.-38 B.-4 C.4 D.38
(4)è¥ +(b+3)2=0,åb-a- çå¼æ¯( )
A.-4 B.-2 C.-1 D.1
(5)ä¸å说æ³æ£ç¡®çæ¯( )
A.两个è´æ°ç¸åï¼çäºç»å¯¹å¼ç¸å B.两个è´æ°çå·®ä¸å®å¤§äºé¶ C.æ£æ°åå»è´æ°ï¼å®é æ¯ä¸¤ä¸ªæ£æ°ç代æ°å D.è´æ°åå»æ£æ°ï¼çäºè´æ°å ä¸æ£æ°çç»å¯¹å¼
(6)ç®å¼-3-5ä¸è½è¯»ä½( )
A.-3ä¸5çå·® B.-3ä¸-5çå C.-3ä¸-5çå·® D.-3åå»5
2.填空é¢ï¼(4â²Ã4=16â²)
(1)-4+7-9=- - + ;
(2)6-11+4+2=- + - + ;
(3)(-5)+(+8)-(+2)-(-3)= + - + ;
(4)5-(-3 )-(+7)-2 =5+ - - + - .
3.æä¸ååå¼åæçç¥æ¬å·çåçå½¢å¼ï¼å¹¶è¯´åºå®ä»¬ç两ç§è¯»æ³ï¼(8â²Ã2=16â²)
(1)(-21)+(+16)-(-13)-(+7)+(-6);
(2)-2 -(- )+(-0.5)+(+2)-(+ )-2.
4.计ç®é¢(6â²Ã4=24â²)
(1)-1+2-3+4-5+6-7;
(2)-50-28+(-24)-(-22);
(3)-19.8-(-20.3)-(+20.2)-10.8;
(4)0.25- +(-1 )-(+3 ).
5.å½x=-3.7,y=-1.8,z=-1.5æ¶,æ±ä¸å代æ°å¼çå¼(5â²Ã4=20â²)
(1)x+y-z;
(2)-x-y+z;
(3)-x+y+z;
(4)x-y-z.
åä¸æ°å¦è®¡ç®é¢å¤§å ¨åçæ¡ãç´ è´¨ä¼åè®ç»ã
(1) (-7)-(+5)+(+3)-(-9)=-7 5 3 9;
(2)-(+2 )-(-1 )-(+3 )+(- ) =( 2 )+( 1 )+( 3 )+( );
(3)-14 5 (-3)=-12;
(4)-12 (-7) (-5) (-6)=-16;
(5)b-a-(+c)+(-d)= a b c d;
2.å½x= ,y=- ,z=- æ¶,åå«æ±åºä¸å代æ°å¼çå¼;
(1)x-(-y)+(-z);
(2)x+(-y)-(+z);
(3)-(-x)-y+z;
(4)-x-(-y)+z.
3.å°±ä¸åç»çä¸ç»æ°,éªè¯çå¼ï¼ a-(b-c+d)=a-b+c-dæ¯å¦æç«.
(1)a=-2,b=-1,c=3,d=5; (2)a=23 ,b=-8,c=-1 ,d=1 .
4.计ç®é¢
(1)-1-23.33-(+76.76);
(2)1-2*2*2*2;
(3)(-6-24.3)-(-12+9.1)+(0-2.1);
(4)-1+8-7
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1.(1)C;(2)B;(3)D;(4)A;(5)C;(6)C 2.(1)4,(-7),(-9) (2)(-6),(-11),(-4),2; (3)-5,8,2,3; (4)3,7,2; 3.ç¥4.(1)-4; (2)-80; (3)-30.5 (4)-5 5.(1)-4; (2)4; (3)0.4; (4)-0.4.
ãç´ è´¨ä¼åè®ç»ã 1.(1)-,+,+; (2)-,+,-,-; (3)+,+; (4)-,+,+; (5)-,+,-,-. 2.(1) (2) (3) (4)- 3.(1) (2)é½æç«. 4.(1)- (2) (3)-29.5 (4)-1 第(4)é¢æ³¨æåå·çæ°ãäºä¸ºç¸åæ°å åå«ç»åã
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