(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y),其中x=4,y=1.5

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(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y),其中x=4,y=1.5
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(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y),其中x=4,y=1.5
(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y),其中x=4,y=1.5

(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y),其中x=4,y=1.5
2.5-0.5-2=0