4m-2n=5,2m+5n=-8
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4m-2n=5,2m+5n=-84m-2n=5,2m+5n=-84m-2n=5,2m+5n=-84m-2n=5①2m+5n=-8②②×2得:4m+10n=﹣16③③-①得:12n=﹣21n=﹣7/4把
4m-2n=5,2m+5n=-8
4m-2n=5,2m+5n=-8
4m-2n=5,2m+5n=-8
4m-2n=5①
2m+5n=-8②
②×2得:4m+10n=﹣16③
③-①得:12n=﹣21
n=﹣7/4
把n=﹣7/4代入②
2m-35/4=﹣8
m=3/8
∴ m=3/8
n=﹣7/4
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