若X= -2 那么3X^3 - 3X^2 - Y^2+5Y+X^2 - 5Y+Y^2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
数学(x-y)^5*(y-x)^3*(x-y)^2
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
3x+2y=6 ,5x+6y=10那么x+y=?
已知4x=5y,那么(3x+y)/(x-2y)=
(2X-3y)-(5x-y)
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
x和y是非零实数,如果(2x-y)/3y=y/x,那么x/y=?