2012年七年级上册数学书25面第5题答案5、(1)-4.2-查字典问答网
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  2012年七年级上册数学书25面第5题答案5、(1)-4.2+5.7-8.4+10(2)-1/4+5/6+2/3-1/2(3)12-(-18)+(-7)-15(4)4.7-(-8.9)-7.5+(-6)(5)(-47/8)-(-51/2)+(-41/4)-(+31/8)(6)(-2/3)+|0-51/6|+|-45/6|+(-91/

  2012年七年级上册数学书25面第5题答案

  5、(1)-4.2+5.7-8.4+10

  (2)-1/4+5/6+2/3-1/2

  (3)12-(-18)+(-7)-15

  (4)4.7-(-8.9)-7.5+(-6)

  (5)(-47/8)-(-51/2)+(-41/4)-(+31/8)

  (6)(-2/3)+|0-51/6|+|-45/6|+(-91/3)

1回答
2020-03-22 14:01
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  (1)-4.2+5.7-8.4+10

  =(5.7+10)-(4.2+8.4)

  =15.7-12.6

  =3.1

  (2)-1/4+5/6+2/3-1/2

  =(5/6+2/3)-(1/4+1/2)

  =3/2-3/4

  =3/4

  (3)12-(-18)+(-7)-15

  =12+18-7-15

  =30-22

  =8

  (4)4.7-(-8.9)-7.5+(-6)

  =4.7+8.9-7.5-6

  =13.6-(7.5+6)

  =13.6-13.5

  =0.1

  (5)(-47/8)-(-51/2)+(-41/4)-(+31/8)

  =-47/8+51/2+41/4-31/8

  =(51/2+41/4)-(47/8+31/8)

  =143/4-78/8

  =143/4-39/4

  =104/4

  =26

  (6)(-2/3)+|0-51/6|+|-45/6|+(-91/3)

  =-2/3+51/6+45/6-91/3

  =(51/6+45/6)-(2/3+91/3)

  =96/6-93/3

  =16-31

  =-15

2020-03-22 14:04:48

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