(1/3-3/5+3/10)/(-7/30) 等于多少?
问题描述:
(1/3-3/5+3/10)/(-7/30) 等于多少?
答
(1/3-3/5+3/10)/(-7/30)
=(1/3-3/5+3/10)×(-30/7)
=1/3×(-30/7)-3/5×(-30/7)+3/10×(-30/7)
=10/7+18/7-9/7
=19/7