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化简:(x+y)(x2-xy+y2)
化简:(x+y)(x2-xy+y2)解:原式= :(x+y)(x2-xy+y2)=x*x^2-x*xy+xy^2+x^2y-xy^2+y^3 =x^3+y^3+(1-1)x^2y+(1-1)xy^2 =x^3+y^3 这个是立方和公式 立方差公式是:x^3-y^3 =(x-y)*(x^2-xy+y^2)
(x+y)(x2-xy+y2)
解:原式=(x+y)[(x-y)²+xy]=(x²-y²)(x-y)+x²y+xy²=x³-x²y-xy²+y³+x²y+xy²(-x²y-xy²+x²y+xy²抵消掉)=x³+y³希望对你有帮助哦~祝学习进步哦~\\(^o^)\/ ...
(x+y)(x^2-xy+y^2) 计算
原式等于:x³-y³这个是立方差公式
(x+y)(x的平方-xy+y的平方) 等于多少
(x+y)(x的平方-xy+y的平方)=x^3+y^3
求方程x+y=x^2-xy+y^2的整数解
因而x^2-xy+y^2>=x^2+y^2,所以x>x+y>=x^2+y^2,但x是整数,所以必有x<=x^2,而y^2>0,故得到x<= x^2+y^2,矛盾!同理,x也不可能是负数。于是x>=0,y>=0。在x+y=x^2-xy+y^2两边同时乘以x+y,得到(x+y)^2=x^3+y^3,但是要注意到如果x,y都大于2的话,...
因式分解 (x+y)(x^2-xy-y^2)
(x+y)(x^2-xy-y^2)=(x+y)[(x^2-xy+y^2)-2y^2]=(x+y)(x^2-xy+y^2)-(x+y)*2y^2 =x^3+y^3-2xy^2-2y^3 =x^3-2xy^2-y^3
急求解 (x+y)(x^2-xy+y^2)-xy(x+y)
求值: (x+y)(x^2-xy+y^2)-xy(x+y)=x^3-+y^3-x^2y-xy^2 分解因式(x+y)(x^2-xy+y^2)-xy(x+y)=(x+y)(x-y)^2
已知: ; ,求x 2 -xy+y 2 的值.
化简x和y,得:,,所以 x+y=6,xy=1,所以x2-xy+y2的值=(x+y)2-3xy=62-3×1=36-3=33.分析:先将x、y分母有理化,再将代数式配方,然后将分母有理化后的x、y代入化简后的解析式即可解答.点评:本题考查了...
(x*2-xy +y*2)\/(x +y)还能化简吗
(x*2-xy y*2)\/(x y)还能化简吗 解:原式=(x^2-xy+y^2)\/(x+y)已经是最减分式了 没有公因式了 互质的
(x2+2xy+y2)( x2-xy+y2)2 化简
(x^2+2xy+y^2)(x^2-xy+y^2)^2 =(x+y)^2*(x^2-xy+y^2)^2 =((x+y)(x^2-xy+y^2))^2 =(x^3+y^3)^2 =x^6+2x^3y^3+y^6