计算.(-5)×(-87/9)-(-7)×(＋79 - 知识问答

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

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(-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

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