2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方

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2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方

2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方
2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方

2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方
2(y-x)²-7(x-y)+6(x-y)-3(y-x)²
=-(y-x)²-(x-y)
=-(x-y)²-(x-y)
=-(x-y)[(x-y)+1]
=(y-x)(x-y+1)

2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方
=(2-3)(y-x)的平方+(6-7)(x-y)
=-(y-x)的平方-(x-y)