{3x-2y=4 { x/2-y+1/3=1 {4y-3x=-2 {3x+2y=1代入消元法解下列方程组 (1){3x-2y=4 (2) { x/2-y+1/3=1 (3){2x-y=5 (4){x/4+y/3=4/3 {4y-3x=-2 {3x+2y=1 {x:y=4:3 {5(x-9)=6(y-2)

问题描述:

{3x-2y=4 { x/2-y+1/3=1 {4y-3x=-2 {3x+2y=1
代入消元法解下列方程组 (1){3x-2y=4 (2) { x/2-y+1/3=1 (3){2x-y=5 (4){x/4+y/3=4/3
{4y-3x=-2 {3x+2y=1 {x:y=4:3 {5(x-9)=6(y-2)

1)3x=4+2y;4y-(4+2y)=-2; y=1 x=22) y=x/2-2/3,3x+2*(x/2-2/3)=1,x=7/12 y= -3/83) y=2x-5,x:(2x-5)=4:3,x=4 y=34) 3x+4y=16,9x+12y=48,12y=48-9x,5x-45=6y-12,10x-90=12y-24,10x-90=(48-9x)-24,x=6 y=...