请用代入法解:{y+1=2(x+2) 2x-3y=1 {y=1-x 5x+2y=8 请利用整体代入法解:请用代入法解:{y+1=2(x+2) 2x-3y=1{y=1-x 5x+2y=8请利用整体代入法解:{(x-3)/2-3y=0 2(x-3)-11=2y解二元一次方程组:{5x-6y=11 8
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/29 22:07:22
![请用代入法解:{y+1=2(x+2) 2x-3y=1 {y=1-x 5x+2y=8 请利用整体代入法解:请用代入法解:{y+1=2(x+2) 2x-3y=1{y=1-x 5x+2y=8请利用整体代入法解:{(x-3)/2-3y=0 2(x-3)-11=2y解二元一次方程组:{5x-6y=11 8](/uploads/image/z/14409971-35-1.jpg?t=%E8%AF%B7%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%EF%BC%9A%7By%2B1%3D2%EF%BC%88x%2B2%EF%BC%89+2x-3y%3D1+%7By%3D1-x+5x%2B2y%3D8+%E8%AF%B7%E5%88%A9%E7%94%A8%E6%95%B4%E4%BD%93%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%EF%BC%9A%E8%AF%B7%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%EF%BC%9A%7By%2B1%3D2%EF%BC%88x%2B2%EF%BC%89+2x-3y%3D1%7By%3D1-x+5x%2B2y%3D8%E8%AF%B7%E5%88%A9%E7%94%A8%E6%95%B4%E4%BD%93%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%EF%BC%9A%7B%EF%BC%88x-3%EF%BC%89%2F2-3y%3D0+2%EF%BC%88x-3%EF%BC%89-11%3D2y%E8%A7%A3%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%9A%7B5x-6y%3D11+8)
请用代入法解:{y+1=2(x+2) 2x-3y=1 {y=1-x 5x+2y=8 请利用整体代入法解:请用代入法解:{y+1=2(x+2) 2x-3y=1{y=1-x 5x+2y=8请利用整体代入法解:{(x-3)/2-3y=0 2(x-3)-11=2y解二元一次方程组:{5x-6y=11 8
请用代入法解:{y+1=2(x+2) 2x-3y=1 {y=1-x 5x+2y=8 请利用整体代入法解:
请用代入法解:
{y+1=2(x+2) 2x-3y=1
{y=1-x 5x+2y=8
请利用整体代入法解:
{(x-3)/2-3y=0 2(x-3)-11=2y
解二元一次方程组:
{5x-6y=11 8x-9y=13
{(y+1)/4=(x+2)/3 2x-3y=1
请用代入法解:{y+1=2(x+2) 2x-3y=1 {y=1-x 5x+2y=8 请利用整体代入法解:请用代入法解:{y+1=2(x+2) 2x-3y=1{y=1-x 5x+2y=8请利用整体代入法解:{(x-3)/2-3y=0 2(x-3)-11=2y解二元一次方程组:{5x-6y=11 8
4
15x-18y=33
16x-18y=26
两式相减
16x-15x=26-33
x=-7
5x7-6y=11
6y=35-11
6y=24
y=4
5
2x=1+3y
x=0.5+1.5y
(y+1)/4=(x+2)/3
3(y+1)=4(x+2)
3y+3=4(0.5+1.5y+2)
3y+3=6y+10
6y-3y=3-10
3y=-7
y=-7/3
x=0.5+1.5y=1/2-3/2x7/3=1/2-7/2=-3
如果本题有什么不明白可以追问,