2.7*18.3-2.7+2.7*2.7 这道题怎么巧算?
问题描述:
2.7*18.3-2.7+2.7*2.7 这道题怎么巧算?
答
2.7*18.3-2.7+2.7*2.7
=2.7x(18.3-1+2.7)
=2.7x20
=54