简算:2.57+13.99
问题描述：
简算:2.57+13.99
答
13.99比14少0.01，加14就多加了0.01.故要减去，
2.57+14-0.01=16.56
答
2.57+13.99
=2.56+(0.01+13.99)
=2.56+14
=16.56
答
2.57+（14-0.01)=2.57+14-0.01=16.57-0.01=16.56
答
2.57+13.99=2,57+14-0.01=16.57-0.11=16.56
望采纳哦~~