若2x-y=3,x-2y=4,则x+y的值是( )
若2x-y=3,x-2y=4,则x+y的值是( )
实数X.Y满足X*X+Y*Y-2X-2Y+1=0,则(Y-4)/(X-2)的取值范围是?
若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
若X=负四分之一,能否确定代数式(2X-Y)(2X+Y)+(2X-Y)(Y-4X)+2Y(Y-3X)的值?
已知x-2y/3y-x=2/3,则y/x的值是
已知方程组4x+y=3,3x+2y=2.则x-y的值是( )
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?
若|3x+2y-4|与6(5x+7y-3)的平方互为相反数,则x y的值是 A X=1 Y=1 B x=2 y=-1 C
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.