3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)

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3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)=

3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)
3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)

3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)
=3(x+y)² - 9(x+y)² -7(x-y)-6(x-y)
=-4(x+y)² +13(x-y)
再算下去就没意思了

3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y)
=3(x+y)²-7(x-y)-9(x+y)²-6(x-y)
=-13(x-y)-6(x+y)²