已知(x+3y-9)*2+|2x-y+10|=o,就x+y得值
已知(x+3y-9)*2+|2x-y+10|=o,就x+y得值
已知2x-y/x+2y=3,求2(2x-y)/x+2y-9(x+2y)/2x-y+3的值.
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知丨x+3|+|2x-y|=o求2(3x-2y)-4[3(x-y)-2(x-2y)]的值
已知x,y,z满足方程组:4x-5y+2z=o;x+4y-3x=0,求x:y:z的值
已知:/x/=2,/y/=3,/x+y/=-(x+y),求代数式(3x-2)^2-3(x-y)得值.
已知X,Y满足X^2+7X+9=0,9Y^2+7Y+1=O,求代数式X^2-1/Y^2的值
已知x,y满足2x-7y=3m,x+2y=4m+5,且x+y=o,求m的值
已知(x+y-7)²+|2x-3y-4|=0 求xy得值
已知4x=9y求(1)x+y/y (2)y-x/2x
已知x+y分之x-y=2,求2x+2y分之x-y-3x-3y分之2x+2y的值