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

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/07/19 13:47:44

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)

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

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