满足2x-3y=11-4m和3x+2y=21+5m的x,y,也满足x+3y=10+7m求m
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满足2x-3y=11-4m和3x+2y=21+5m的x,y,也满足x+3y=10+7m求m满足2x-3y=11-4m和3x+2y=21+5m的x,y,也满足x+3y=10+7m求m满足2x-3y=11
满足2x-3y=11-4m和3x+2y=21+5m的x,y,也满足x+3y=10+7m求m
满足2x-3y=11-4m和3x+2y=21+5m的x,y,也满足x+3y=10+7m求m
满足2x-3y=11-4m和3x+2y=21+5m的x,y,也满足x+3y=10+7m求m
2x-3y=11-4m①
3x+2y=21+5m②
x+3y=10+7m③
①+③,得3x=21+3m,x=7+m
①*2+②*3,得13x=22-8m+63+15m,13x=85+7m
13(7+m)=85+7m
91+13m=85+7m
5m=-6
m=-6/5
M=-1/6
x+3y=10+7m 和2x-3y=11-4m相加得到x=7+m代入3x+2y=21+5m得到21+3m+2y=21+5m所以y=m
代入最后一个：7+m+3m=10+7m.所以m=-1
x=6，y=-1
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