-X+2Y=5,则5(X-2Y)²-3(x-2y)-60的值
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
-X+2Y=5,则5(X-2Y)²-3(x-2y)-60的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.
已知X/Y=5/3,求X/(X+Y)+X/(X-Y)-Y*2/(X*2-Y*2)的值.