5x-9y=2 x-2y=5
4个回答
由5x-9y=5得
x=1+9y/5
代入2x-2y=5得
2+18y/5-2y=5计算得
y=15/8
代入x=1+9y/5得
x=35/8
相关问题
|3x+2y+3|+(5y+2x-9)^2=0,求3x-2y的值 (5y+2x-9)^2是(5y+2x-9)的平方.
解下列方程组{4x-3y=5 2x+5y=9 {x+y=2 x-y=0 {x+2y=6 x-2y=-2 {5x-y=16
2X=3Y,4x-5y=2 -6x+5y=3,3x=4y 2x+3y=5,3x=y-9 3x=1-y,3x=2y-5
5x=3y,(2x+y)的平方=5x(x+y)+9
(x=0.5y=6.5)(x=1y=7.5)(x=1.5y=8.5)(x=2y=9.5)(x=2.5y=10.5)写出x
(1)x-y=3 x+y=5 (2)2x+y=32 2x+y=0 (3)3x+2y=5 x+3y=9 (4)6x+5z=
{2x-5y=21,{2x+y=6 {x-3y=1 {y=-2x+3 y=-x; y=1/2x+1 5x-9y=-13
1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3
①.x2-2x-1 ②.4(x-y+1)+y(y-2x) ③.3x2+5xy-2y2+x+9y-4 ④.x2-5x+3
X=2Y,X-9=5*(Y-9)怎么解,