13.8*7.6-(4.29+3.31)*8.8巧算
问题描述:
13.8*7.6-(4.29+3.31)*8.8巧算
答
13.8*7.6-(4.29+3.31)*8.8
=13.8*7.6-7.6*8.8
=7.6*(13.8-6.8)
=7.6*7
=53.2