1).6x=6-5（2-2x) (2).2(10-0.5y)=-(1.5y+2)

6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y 已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y x+y/2+x-y/3=5/6;x=y/6-x-y/3=1/2 2x+y=4x-y-1/2=10+6x+2y/4 3x+2y=6 ,5x+6y=10那么x+y=? 3x+2y/4=2x+y/5=x-y+1/6 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20