(3x+2y)²= ?
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
化简后求值 [(x-2y)²+(x-2y)(x-2y)-2x(2x-y)]÷2x 其中x=2 y=3
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)
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知x+3y=2,求代数式(x²-y²/x+y)-【2(x+y)】的值
先化简,再求值:(3x-y)²+(3x+y)(3x-y),其中x=1,y=-2
(2x+3y)²-(2x+y) (2x-y),其中,x=三分之一,y=负二分之一
先化简,再求值.已知x=-2,y=125分之一,求x(3x-2y)+(2x+y)²+(2x-y)(x+y)-3
(X-Y)²+(3X-2Y)(2X+Y)-X(6X-Y),其中X=½,Y=1(先化简再求值)