【有理数加减法运算(+1)+(-2)+(+3)+(-4)+(-查字典问答网
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  【有理数加减法运算(+1)+(-2)+(+3)+(-4)+(+5)+(-6).+(+99)+(-100)(+1.7)+(-3.5)+(+9.2)+(-12)+4.6(-1.5)-(-9.4)-(+3.6)+(-4.3)-(+5.2)16.96+(-3.8)+5.2(-0.2)+(-0.96)】

  有理数加减法运算

  (+1)+(-2)+(+3)+(-4)+(+5)+(-6).+(+99)+(-100)

  (+1.7)+(-3.5)+(+9.2)+(-12)+4.6

  (-1.5)-(-9.4)-(+3.6)+(-4.3)-(+5.2)

  16.96+(-3.8)+5.2(-0.2)+(-0.96)

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2020-06-0923:09
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林安

  (+1)+(-2)+(+3)+(-4)+(+5)+(-6).+(+99)+(-100)

  =(1-2)+(3-4)+..+(99-100)

  =-1-1+...+(-1)

  =-1×50

  =-50;

  (+1.7)+(-3.5)+(+9.2)+(-12)+4.6

  =1.7+9.2+4.6-(3.5+12)

  =15.5-15.5

  =0;

  (-1.5)-(-9.4)-(+3.6)+(-4.3)-(+5.2)

  =9.4-(1.5+3.6+4.3+5.2)

  =9.4-(5.8+8.8)

  =9.4-14.6

  =-5.2;

  16.96+(-3.8)+5.2(-0.2)+(-0.96)

  =(16.96-0.96)+5.2-(3.8+0.2)

  =16+5.2-4

  =16+1.2

  =17.2;

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2020-06-09 23:12:49
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