计算 (x平方+2xy+y平方)(x平方-xy+y平方)平方
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以下用 a^b 表示 a的b次方。比如:x^2表示x的平方。圆樱正
= = = = = = = = =
解:橘悔原式 =(x+y)^2 *(x^2 -xy +y^2)^2
=[ (x+y) (x^2 -xy +y^2) ]^2
=(x^3 +y^3)^2
=x^6 +2(x^3)(y^3) +y^6.
= = = = = = = = =
立方和公式:(x+y) (x^2 -xy +y^2) =x^3 +y^3.
立方差公式:(x-y) (x^2 +xy +y^2) =x^3 -y^3.
注意正颂圆负!
= = = = = = = = =
解:橘悔原式 =(x+y)^2 *(x^2 -xy +y^2)^2
=[ (x+y) (x^2 -xy +y^2) ]^2
=(x^3 +y^3)^2
=x^6 +2(x^3)(y^3) +y^6.
= = = = = = = = =
立方和公式:(x+y) (x^2 -xy +y^2) =x^3 +y^3.
立方差公式:(x-y) (x^2 +xy +y^2) =x^3 -y^3.
注意正颂圆负!
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