代入法:4m-3n=4,2m-n=2

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代入法:4m-3n=4,2m-n=2代入法:4m-3n=4,2m-n=2代入法:4m-3n=4,2m-n=22m-n=2得n=2m-2代入4m-3n=4,4m-3(2m-2)=44m-6m+6=4-2

代入法:4m-3n=4,2m-n=2
代入法:4m-3n=4,2m-n=2

代入法:4m-3n=4,2m-n=2
2m-n=2 得n=2m-2 代入4m-3n=4,
4m-3(2m-2)=4
4m-6m+6=4
-2m=-2
m=1
n=2m-2=2*1-2=0

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

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


4m-3n=4 1
2m-n=2 2
由2得n=2m-2 3
把3代入1得4m-3x(2m-2)=4
解得m=1
把m=1代入3得n=0
所以m=1,n=0