用加减消元法解下列方程组2m-1/5+3n-2/4=2,3m+1/5-3n+2/4=0
问题描述:
用加减消元法解下列方程组2m-1/5+3n-2/4=2,3m+1/5-3n+2/4=0
答
2m-1/5+3n-2/4=2,(1)
3m+1/5-3n+2/4=0(2)
(1)+(2)5m=2,m=2/5
代入(1)2*2/5-1/5+3n-2/4=2
-4/5+1/5+2/4+2=3n
19/10=3n
n=19/30
所以
m=2/5
n=19/30