3m-4n=7 9m-10n+25=0 求mn
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3m-4n=79m-10n+25=0求mn3m-4n=79m-10n+25=0求mn3m-4n=79m-10n+25=0求mn我来回答你:3m-4n=7-----------------------1
3m-4n=7 9m-10n+25=0 求mn
3m-4n=7 9m-10n+25=0 求mn
3m-4n=7 9m-10n+25=0 求mn
我来回答你:
3m-4n=7-----------------------1
9m-10n+25=0-------------------2
用1式乘3减去2式
可以得到:
2n=-46
n=-23
带回1式可以得到:m=-85/3
那么mn=1955/3
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
.4(m+n)^2*(m+n)^3-7(m+n)(m+n)^4+5(m+n)^5=
m/n=7/3则m+n/m-n
求方程组 3m-4n=7 9m-10n+23=0
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