(x2+y2)(x2-y2)化简
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(x2+y2)(x2-y2)化简
(x2+y2)(x2-y2)化简
(x2+y2)(x2-y2)化简
(x2+y2)(x2-y2)
=X^4-y^4
x^4-y^4
(x2+y2)(x2-y2)化简
(x2+2xy+y2)( x2-xy+y2)2 化简
(x2+xy+y2)-4xy(x2+y2)
X2+Y2+Z2
直线x2+y2
x2/25+y2/16
(a2+b2)(x2+y2)
-(x2-2xy-y2)+(5x2-2xy-3y2)-(x2-2xy-y2)+(5x2-2xy-3y2)化简
化简(X2+y2-z2-2xy)/(x2-y2+z2-2xy)/(x2-y2-z2+2xy)(x2+y2-z2+2xy)
2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)] 化简.
(2x2-3xy+4y2)+(x2+2xy-3y2)化简(要有过程)
(x2+y2)(x2-xy+y2)-2x2y2因式分解
分式分解:4y2-x2/-x2-4y2+4xy
因式分解 (x2-y2)2-8(x2+y2-2)
x2+xy+y2=19求x2+y2最小值
(x2-2xy+y2)-(x2+2xy+y2)=什么
( x2+xy+y2) ( x2+xy+2y2)-12y4
二重积分∫∫D(x2+y2)dxdy,D:x2+y2