x/24+y/18=11/12 x/8+y/16=3/2,
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
解方程 2x+3y=21 5x+4y=59 12x+5y=99 2x+3y=18 2x+3y=24 8x+5y=51 5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
2(x+y) 3x+3y=24 x+y/2x x y/2y= 1
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
{x=y-3 {x+y=11 {2x+y=13 {3x-2y=8
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)
已知x+y/y=11/8,求x-y/x+2y的值.
用代入法解下列方程组:(1)y=3x 16x-y=18 (2)3x+y=8 3x-y=4 (3)x+5y=5 2x-5y
{3X+2Y=22 5X+4Y=28 {4X+3Y=12 5X+2Y=11 {6X+5Y=21 5X+8Y=22 二元一
不解方程组2x-y=12 x+2y=11求(2x-y)^3-(2x-y)^2(x-3y)的值