4x+5y=105,2x+3y=178,x,y等于
4x+5y=105,2x+3y=178,x,y等于
x/4+2等于x,x=多少.y/5等于y-3,Y=多少
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
2x+y=4 x+2y=5 x+y等于?
x-y/3=x+y/2 2x-5y=7等于多少
y*y*y*y+2x*x*x*x=4x*x*y 求x等于几,y等于几,写出所有选项!
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(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)+...-(