{3m-4n=7 9m-10n+25=0用代入法
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{3m-4n=79m-10n+25=0用代入法{3m-4n=79m-10n+25=0用代入法{3m-4n=79m-10n+25=0用代入法由(1)得3m=4n+7∴m=(4n+7)/3(3)(3)代入
{3m-4n=7 9m-10n+25=0用代入法
{3m-4n=7 9m-10n+25=0用代入法
{3m-4n=7 9m-10n+25=0用代入法
由(1)得
3m=4n+7
∴m=(4n+7)/3 (3)
(3)代入(2)得
3(4n+7)-10n+25=0
12n+21-10n+25=0
∴n=23
把n=23代入(1)得
m=33
∴m=33,n=23
代入法
因为3m-4n=7 所以有m=(7+4n)/3
把m=(7+4n)/3代入第二个式子
有3(7+4n)-10n+25=0
解得n=-23
所以m=-85/3
求采纳
3m-4n=7 9m-10n+25=0 求mn
解方程组:{ 3m-4n=-7 9m-10n+25=0
{3m-4n=7 9m-10n+25=0用代入法
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