∵n分之m=3分之5∴n=3m/5(m+n分之m) + (m-n分之m) - (m方-n方,分之n方)=m/(m+n)+m/(m-n)-n²/(m²-n²)=(m²-mn+m²+mn-n²)/(m-n)(m+n)=(m²+m²-n²)/(m²-n²)=m
...=m²/(m²-n²)+1��һ����ô����=(m²+m²-n²)/(m²-n²)=m²/(m²-n²)+(m²-n²)/(m²-n²)=m²/(m²-n²)+1