(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
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(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5(x-y)(x-2y)+(x-2y)(x-7y),其中X
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
(x-y)(x-2y)+(x-2y)(x-7y)
=（x-2y)[(x-y)+(x-7y)]
=(x-2y)(2x-8y)
=2(x-2y)(x-4Y)
其中X=4,Y=1.5
原式=2*（4-1.5*2）（4-4*1.5）
=2*1*（-2）
=-4
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