题目好象错了
5.7*7/11+507*7/11
应为5.7*7/11+50.7*7/11
5.7*7/11+50.7*7/11
=7/11*(5.7+50.7)
=7/11*(5.7+5.7*10)
=7/11*(5.7*11)
=7*5.7
=39.9
题目好象错了
5.7*7/11+507*7/11
应为5.7*7/11+50.7*7/11
5.7*7/11+50.7*7/11
=7/11*(5.7+50.7)
=7/11*(5.7+5.7*10)
=7/11*(5.7*11)
=7*5.7
=39.9