计算.(-5)×(-87/9)-(-7)×(＋79/9)+1-查字典问答网

来自潘锐的问题

　　计算.(-5)×(-87/9)-(-7)×(＋79/9)+12÷(-9/79)不好意思,问题弄错了应该是(-5)×(-79/9)-(-7)×(＋79/9)+12÷(-9/79)

　　计算.(-5)×(-87/9)-(-7)×(＋79/9)+12÷(-9/79)

　　不好意思,问题弄错了应该是(-5)×(-79/9)-(-7)×(＋79/9)+12÷(-9/79)

3回答

2020-07-23 08:08

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马颂德

　　(-5)×(-87/9)-(-7)×(＋79/9)+12÷(-9/79)

　　=5×87/9+7×79/9-12×79/9

　　=5×87/9+79/9*（7-12）

　　=5×87/9-5×79/9

　　=5/9×（87-79）

　　=5/9×8

　　=40/9

2020-07-23 08:10:52

潘锐

　　不好意思，问题弄错了应该是(-5)×(-79/9)-(-7)×(＋79/9)+12÷(-9/79)

2020-07-23 08:12:15

马颂德

　　(-5)×(-79/9)-(-7)×(＋79/9)+12÷(-9/79)=5×79/9+7×79/9-12×79/9=79/9*(5+7-12)=79/9*0=0

2020-07-23 08:14:19

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