4y(y-x)平方-6y(x-y)立方怎么计算

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4y(y-x)平方-6y(x-y)立方怎么计算

4y(y-x)平方-6y(x-y)立方怎么计算
4y(y-x)平方-6y(x-y)立方怎么计算

4y(y-x)平方-6y(x-y)立方怎么计算
4y(y-x)平方-6y(x-y)立方
=4y(x²-2xy+y²)-6y(x³-3x²y+3xy²-y³)
=4x²y-8xy²+4y³-6x³y+18x²y²-18xy³+6y^4

4y(y-x)平方-6y(x-y)立方
=2y(x-y)²[2-3﹙x-y﹚]
=2y﹙x-y﹚﹙2-3x+3y﹚

4y(y-x)平方-6y(x-y)立方
=2y(x-y)^2(2-3x+3y)

x^2-3x-4y^2+6y =x^2-3x+(3/2)^2-[4y^2-6y+(3/2)^2] =(a的平方(b-c)-4(b-c)-3a(c-b) =(b-c)(a^2-4+3a) =(b

提出y(y-x)平方 得:y(y-x)平方*[4+6(y-x)] 再计算就容易多了