利用加减消元法解二元一次方程组m/3-n/4=-1,.m/2+n/3=7
2019-05-07
利用加减消元法解二元一次方程组
m/3-n/4=-1,.m/2+n/3=7
优质解答
m/3-n/4=-1
两边同乘12
4m-3n=-12 (1)
m/2+n/3=7
两边乘6
3m+2n=42 (2)
{4m-3n=-12 (1) 3m+2n=42 (2)}
(1)×2+(2)×3
8m+9m=-24+126
17m=102所以
m=6
n=12
m/3-n/4=-1
两边同乘12
4m-3n=-12 (1)
m/2+n/3=7
两边乘6
3m+2n=42 (2)
{4m-3n=-12 (1) 3m+2n=42 (2)}
(1)×2+(2)×3
8m+9m=-24+126
17m=102所以
m=6
n=12