Question

已知:n分之m=3分之5,求(m+n分之m) + (m-n分之m) - (m方-n方,分之n方) 我要详解？

Answer 1

∵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)
=m²/(m²-n²)+1
=m²/(m²-9m²/25)+1
=m²/(16m²/25)+1
=25/16+1
=41/16,6,
我胖乎乎 举报
=m²/(m²-n²)+1 һô =(m²+m²-n²)/(m²-n²) =m²/(m²-n²)+(m²-n²)/(m²-n²) =m²/(m²-n²)+1,已知:n分之m=3分之5,求(m+n分之m) + (m-n分之m) - (m方-n方,分之n方) 我要详解
=[2(m/n)^2-1]/[(m/n)^2-1]