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