分解因数(X-1)的平方-2Y(X-1) Y的平方
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原式=(x-y)²-2(x-y)+1=(x-y-1)²
[(x+2y)的平方-(x+y)(x-y)-5y的平方]除以(2x)=(x²+4xy+4y²-x²+y²-5y²)÷2x=4xy÷2x=2y
(x-y)(x-y-2)-3
x^2(y^2-1)+2x(y^2-1)+(y^2-1)=(y^2-1)(x^2+2x+1)=(y-1)(y+1)(x+1)^2
3x^2+5xy-2y^2+x+9y-4=(3x-y)(x+2y)+4x+8y-3x+y-4={(3x-y)+4}(x+2y)-3x+y-4=(3x-y+4)(x+2y-1)
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双十字相乘.
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