(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2,其中x=1.5,y=3.9

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(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2,其中x=1.5,y=3.9
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(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2,其中x=1.5,y=3.9
(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2,其中x=1.5,y=3.9

(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2,其中x=1.5,y=3.9
过程写的有点乱,不过应该能看懂
化简(x-1/2y-1)(x-1/2y+1)(x-1/2y-1)^2,第二个我是当+作的
化简
=[(x-1/2y)-1][(x-2y)+1](x-2y-1)^2 注：^这个是乘的意思么?
之后把前两项用平方和还是叫什么名字的合并
变成[（x-1/2y）的2次幂-1][（x-1/2y）-1]^2
然后展开变成
2（x-1/2y）的3次幂-2（x-1/2y）的2次幂-2（x-1/2y）+2

原式=(x-1/2y-1)[(x-1/2y+1)-(x-1/2y-1]
=2(x-1/2y-1)
=2x-y-2
=2*1.5-3.9-2
=-2.9

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