解二元一次方程组..4m-2n+5=0和3n-4m=6

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解二元一次方程组..4m-2n+5=0和3n-4m=6解二元一次方程组..4m-2n+5=0和3n-4m=6解二元一次方程组..4m-2n+5=0和3n-4m=64m-2n+5=0.13n-4m=6.

解二元一次方程组..4m-2n+5=0和3n-4m=6
解二元一次方程组..4m-2n+5=0和3n-4m=6

解二元一次方程组..4m-2n+5=0和3n-4m=6
4m-2n+5=0.1
3n-4m=6.2
1式+2式得
n+5=6
n=1
将代入1式得
4m-2+5=0
4m+3=0
4m=-3
m=-3/4

4m-2n+5=0 (1)
3n-4m=6 (2)
(1)+(2)
3n-2n+5=6
所以n=1
m=(3n-6)/4=-3/4

两个方程相加,得n+5=6,则n=1
代入第2个方程,得3-4m=6,得m=-3/4