-2x-〔4x-2y-〈3x-(2y+1)〉-10〕
-2x-〔4x-2y-〈3x-(2y+1)〉-10〕
1、x(x-y)(x+y)-x(x+y)^2
先化简再求值:-3(2x-y)-{7-〔6x+2y-(10x-8y)〕+x-2(3x-4y)}已知x=-1/5,y=-5
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
化简求值 -3(2x-y)-{7x-〔6x+2x-(10x-8y)〕-x-2(3x-4y)}
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(1)(x^2/x)-y-x-y
(x+3y-4)(2x-y)