计算:(x-y+9)(x+y-9)
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计算:(x-y+9)(x+y-9)计算:(x-y+9)(x+y-9)计算:(x-y+9)(x+y-9)(x-y+9)(x+y-9)=[x-(y-9)][x+(y-9)]=x^2-(y-9)^2(x-y
计算:(x-y+9)(x+y-9)
计算:(x-y+9)(x+y-9)
计算:(x-y+9)(x+y-9)
(x-y+9)(x+y-9)
=[x-(y-9)][x+(y-9)]
=x^2-(y-9)^2
(x-y+9)(x+y-9)
=[x-(y-9)]*[x+(y-9)]
=x^2-(y-9)^2
=x^2-y^2+18y-81
x*x-y*y-81+18x
x^2-(y-9)^2
x^2-y^2-81
[x-(y-9)]*[x+(y-9)]
=x*x-(y-9)*(y-9)
=……
下面的自己算。。不会输平方号就是麻烦
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