5m-6mn-5n/4m+3mn-4n 1/m-1/n=9原题是:5m-6mn-5n/4m+3mn-4n
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5m-6mn-5n/4m+3mn-4n1/m-1/n=9原题是:5m-6mn-5n/4m+3mn-4n5m-6mn-5n/4m+3mn-4n1/m-1/n=9原题是:5m-6mn-5n/4m+3mn-
5m-6mn-5n/4m+3mn-4n 1/m-1/n=9原题是:5m-6mn-5n/4m+3mn-4n
5m-6mn-5n/4m+3mn-4n 1/m-1/n=9
原题是:5m-6mn-5n/4m+3mn-4n
5m-6mn-5n/4m+3mn-4n 1/m-1/n=9原题是:5m-6mn-5n/4m+3mn-4n
5m-6mn-5n/4m+3mn-4n
分子分母同除以mn,得:
(5/n-6-5/m)/(4/n+3-4/m)
=(5×(-9)-6)/(3+4×(-9))
=(-51)/(-33)
=17/11
分子分母同除以mn,得:(5/n-6-5/m)/(4/n+3-4/m)=(5×(-9)-6)/(3+4×(-9))=(-51)/(-33)=17/11
m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn)
先化简,再求值(3M-5M+4MN)-(2M-4N+6MN)
若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值
3(m^2-mn+2n^2)-2(mn-m^2+n^2)+(5mn-4n^2+1)
5m-6mn-5n/4m+3mn-4n 1/m-1/n=9原题是:5m-6mn-5n/4m+3mn-4n
(3m-5n+4mn)-(2m-4n+6mn)其中m-n=7,mn=-5
(3m-5n+4mn)-(2m-4n+6mn) mn=-5 m-n=7快帮我打答吧!谢谢了!
若m-n=7,mn=-5,求(3m-5n+4mn)-(2m-4n+6mn)的值.
若m-n=7,mn=5求(3m-5n+4mn)-(2m-4n+6mn)要计算过程]
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