已知方程;①x-2=3/x;②0.4x=11;③x/2=5x-1;④y²-4y=3;⑤t=0;⑥x+2y=1,
已知方程;①x-2=3/x;②0.4x=11;③x/2=5x-1;④y²-4y=3;⑤t=0;⑥x+2y=1,
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
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+y)-(x+y)平方 因式分解 解方程 2x²=3x (3x-1)² - 4=0 5x-15x
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知4x=9y求(1)x+y/y (2)y-x/2x
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1