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网友回答
设买x本两个商店的钱一样
10*1+0.7(x-10)=0.85x
10+0.7x-7=0.85x
0.7x-0.85x=-10+7
-0.15x=-3
x=20======以下答案可供参考======
供参考答案1:
200个供参考答案2:
(1-70%)*10/(1-85%)
=3/0.15
=20本供参考答案3:
(1-70%)*10/(1-80%)
=3/0.2
=15本