如果a:b=40.那么A/4:B/2等于

问题描述:

如果a:b=40.那么A/4:B/2等于

a/4:b/2
=a/4÷b/2
=a/4×2/b
=a/2×1/b
=1/2×(a:b)
=1/2×40
=20