m+2n=2,3m+4n=8,求m+n=几
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m+2n=2,3m+4n=8,求m+n=几m+2n=2,3m+4n=8,求m+n=几m+2n=2,3m+4n=8,求m+n=几m+2n=2,.(1)3m+4n=8.(2)(1)*2:2m+4n=4.(
m+2n=2,3m+4n=8,求m+n=几
m+2n=2,3m+4n=8,求m+n=几
m+2n=2,3m+4n=8,求m+n=几
m+2n=2,.(1)
3m+4n=8.(2)
(1)*2:2m+4n=4.(3)
(2)-(3):m=4
4+2n=2
n=-1
m+n=4-1=3
m+2n=2 (1)
3m+4n=8 (2)
(1)*2得2m+4n=4 (3)
(2)-(3)得 m =4
m=4代入（1）得n =-1
m+n=3
(②-①)/2 => m+n=3
m+2n=2 3m+6n=6
3m+4n=8 则 3m+4n=8 可以求出n=-1，那么m=4，所以m+n=3
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