1+2X=3+Y 5X=4Y的答案
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
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
2元一次方程组的答案(1)2x+3y=40 (2)5x+2y=18 (3)7x+2y=11 y=2x y=-x x-y=
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
先化简,再求值:[(2x+y)²-(2x-y)(2x+y)]÷(2y),其中x=3,y=-1的答案
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
已知|x+2|+|y-3|=0,求-1/2x+5/3y+4xy的值,答案越多越好
3x-2y=1 4x-5y
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值