(x-y+9)(x+y-9)则么算
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(x-y+9)(x+y-9)则么算(x-y+9)(x+y-9)则么算(x-y+9)(x+y-9)则么算(x-y+9)(x+y-9)=x²-(y-9)²=x²-(y&sup
(x-y+9)(x+y-9)则么算
(x-y+9)(x+y-9)则么算
(x-y+9)(x+y-9)则么算
(x-y+9)(x+y-9)
=x²-(y-9)²
=x²-(y²-18y+81)
=x²-y²+18y-81
=[x-(y-9)][x+(y-9)]
(x-y+9)(x+y-9)
=(x-（y-9）)(x+（y-9）)
=x^2-(y-9)^2
==x^2-y^2+18y-81
把y-9看成一个整体,然后用平方差公式算
原式=[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-y+9)(x+y-9)则么算
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