若方程组x+y=3-2m/5 2x+3y=4-3m的解x、y满足x扫码下载作业帮搜索答疑一搜即得
问题描述:
若方程组x+y=3-2m/5 2x+3y=4-3m的解x、y满足x 扫码下载作业帮
搜索答疑一搜即得
答
先解方程,求出x、y的值,即:x=5+9m/5 y=-2-11m/5
因x
答
解方程组x+y=3-2m/5 2x+3y=4-3m得:
x=5+9m/5,y=-2-11m/5
5+9m/5m
答
x+y=3-2m/5 (1)
2x+3y=4-3m (2)
(2)-2*(1)得:
y=4-3m-6+4m/5=-11m/5-2
x=3-2m/5+11m/5+2=9m/5+5
x
答
x+y=3-2m/5 (1)
2x+3y=4-3m (2)
(1)×5-(2)×2
5x+5y-4x-6y=15-2m-8+6m
x-y=4m+7
x