10-5y=6-2y 和0.5x+2=3-1.5x
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知3X+8y=10,5X+2y=6 求X 和Y的值
已知3X+8y=10,5X+2y=6 求X 和Y的值,
已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y
3x+2y=6 ,5x+6y=10那么x+y=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
3x+2y=5 3y+2x=5 求x和y
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1
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