问题
解答题
(-5)×(-8
|
答案
(-5)×(-8
)-(-7)×(+7 9
)+12÷(-79 7
)9 79
=5×
+7×79 9
-12×79 7 79 9
=
×（5-12）+7979 9
=79×（1-
）7 9
=79×2 9
=17
．5 9
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(-5)×(-8
|
(-5)×(-8
)-(-7)×(+7 9
)+12÷(-79 7
)9 79
=5×
+7×79 9
-12×79 7 79 9
=
×（5-12）+7979 9
=79×（1-
）7 9
=79×2 9
=17
．5 9