4+12(x-y)+9(x-y)2次方不懂

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4+12(x-y)+9(x-y)2次方不懂4+12(x-y)+9(x-y)2次方不懂4+12(x-y)+9(x-y)2次方不懂4+12(x-y)+9(x-y)2次方=[2+3(x-y)]2次方

4+12(x-y)+9(x-y)2次方不懂
4+12(x-y)+9(x-y)2次方
不懂

4+12(x-y)+9(x-y)2次方不懂
4+12(x-y)+9(x-y)2次方
=[2+3(x-y)]2次方