15x^2-20xy-x+8y-2
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15x^2-20xy-x+8y-215x^2-20xy-x+8y-215x^2-20xy-x+8y-215x^2-20xy-x+8y-2=(15x²-x-2)-(20xy+8y)=(3x+1
15x^2-20xy-x+8y-2
15x^2-20xy-x+8y-2
15x^2-20xy-x+8y-2
15x^2-20xy-x+8y-2
=(15x²-x-2)-(20xy+8y)
=(3x+1)(5x-2)-4y(5x-2)
=(5x-2)(3x+1-4y)
=(5x-2)(3x-4y+1)
也可以把原式化为15x²+(-20y-1)x+8y-2再用十字相乘法,求根法分解.
15x^2-20xy-x+8y-2
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
因式分解:8(x-2y)-x(7x+y)+xy.
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