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(x+3y)的平方-x-3y
=(x+3y)^2-(x+3y)
=(x+3y)-[(x+3y)-1]
=(x+3y)-(x+3y-1)
ab(x-y)的平方+b(y-x)的三次方
=ab(x-y)^2+b(y-x)^3
=ab(y-x)^2+b(y-x)^3
=(y-x)^2[ab+b(y-x)]
=(y-x)^2(ab+by-bx)
=(x+3y)^2-(x+3y)
=(x+3y)-[(x+3y)-1]
=(x+3y)-(x+3y-1)
ab(x-y)的平方+b(y-x)的三次方
=ab(x-y)^2+b(y-x)^3
=ab(y-x)^2+b(y-x)^3
=(y-x)^2[ab+b(y-x)]
=(y-x)^2(ab+by-bx)
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展开全部
=(x+3y)²-(x+3y )
=(x+3y)(x+3y -1)
=b(x-y)²(a-x+y)
=(x+3y)(x+3y -1)
=b(x-y)²(a-x+y)
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