a^2(X一y)+16(y一X)
计算(一x一y)(x一y)+(x+y)
(X一2y)(x十2y)一(x十2y)^2
(x^2 y一4y)/(xy一2y)因式分解
(X十y)的平方一2X一2y十1分解因式
一.(x+2y)×(x-2y)-(2x-y)(-2x-y),其中x=8,y=-8.
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7
一、(1)(1/a+1/b)²÷(1/a²-1/b²);(2) (x/x+y+2y/x+y
已知2X一3y一4=0,求(2X一3y)一4X十6y十7的值
[高一数学]已知集合A={(x,y)||x|+|y|≤1},B={(x,y)|x^2+y^2≤1},C={(x,y)||
一、分解因式:a(x-y)-x+y
一、 化简求值1 (x-2-(12)/(x+2))/(4-x)/(x+2)2【(x-y)²+(x+y)(x-y
己知(3X一2y+1)的平方与|4X一3y一3|互为相反数,求X,y的值?