已知㏒2(㏒3(㏒4X))=㏒3(㏒4(㏒2Y))=O,求X+Y=?
已知㏒2(㏒3(㏒4X))=㏒3(㏒4(㏒2Y))=O,求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,y满足2x-7y=3m,x+2y=4m+5,且x+y=o,求m的值
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
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2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知x/y=3/2求代数式4x-9y/2x+3y
已知4x-2y=0,求x-y/3x+2y的值