题:(1/2)√30 · 40√(1/2)·(3/2)√(2+2/3)

问题描述:

题:(1/2)√30 · 40√(1/2)·(3/2)√(2+2/3)

(1/2)√30 · 40√(1/2)·(3/2)√(2+2/3)
=(1/2)√30 · 40√(1/2)·(3/2)√(8/3)
=(1/2)·40·(3/2)√(30·1/2·8/3)
=30√40
=30√(2²·10)
=30·2√10
=60√10