(2)(4)因式分解
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(2)接下来是=5xy(x-2)(x-3)
(4)x^2-xz+yz-y^2=(x^2-y^2)+(y-x)z=(x+y)(x-y)-(x-y)z=(x-y)(x+y-z)
(4)x^2-xz+yz-y^2=(x^2-y^2)+(y-x)z=(x+y)(x-y)-(x-y)z=(x-y)(x+y-z)
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