4(x+y)²-12(x+y)(x-y)+9(x-y)²
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4(x+y)²-12(x+y)(x-y)+9(x-y)²4(x+y)²-12(x+y)(x-y)+9(x-y)²4(x+y)²-12(x+y)(x-y
4(x+y)²-12(x+y)(x-y)+9(x-y)²
4(x+y)²-12(x+y)(x-y)+9(x-y)²
4(x+y)²-12(x+y)(x-y)+9(x-y)²
(a-b)的平方 的 公式 a=2(x+y)b=3(x-y)