七年級(jí)下冊(cè)20篇完形填空與答案

擇題連同答案

我也急需?。。?！

解：把x=0和y=2代入方程，得：2n=8
n=4
當(dāng)n=4時(shí),mx+ny=8
mx+4y=8
把x=4,y=1代入mx+4y=8
得：4m+4=8
m=1
則m=1,n=4.

它是一本書。

哪個(gè)版本的啊？

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買本參考書就行了