数学题;已知a分之1+b分之1=根号5(A不等于b),求b(a-b)分之a-a(a-b)分之b的值
问题描述:
数学题;已知a分之1+b分之1=根号5(A不等于b),求b(a-b)分之a-a(a-b)分之b的值
答
1/a+1/b=√5
b(a-b)分之a-a(a-b)分之b
=a/b(a-b)-b/a(a-b)
通分
=(a²-b²)/[ab(a-b)]
=(a+b)(a-b)/[ab(a-b)]
=(a+b)/(ab)
=1/a+1/b
=√5