来自樊红东的问题
解方程组,格式过程最重要5x+2y=17······①2x+3y=9······②3x+4y=24·········①5x+4y=32·····②
解方程组,格式过程最重要
5x+2y=17······①
2x+3y=9······②
3x+4y=24·········①
5x+4y=32·····②
1回答
2019-10-23 19:24
解方程组,格式过程最重要5x+2y=17······①2x+3y=9······②3x+4y=24·········①5x+4y=32·····②
解方程组,格式过程最重要
5x+2y=17······①
2x+3y=9······②
3x+4y=24·········①
5x+4y=32·····②
解
5x+2y=17①
2x+3y=9②
①×3得:15x+6y=51③
②×2得:4x+6y=18④
③-④得:
11x=33
x=3,y=1
3x+4y=24①
5x+4y=32②
②-①得:
2x=8
x=4,将x=4代入①得:
y=3
∴方程组的解为:x=4,y=3