Question

14.56加25.4加1.85的简便方法？

Answer 1

14.56+25.4+1.85
=14.6-0.04+25.4+1.85
=14.6+25.4+（1.85-0.04）
=40+1.81
=41.81

Answer 2

用凑整法运算可以简便一些。
14.56+25.4+1.85
=14+0.56+25+0.4+2-0.15
=(14+25+2)+(0.56+0.4-0.15)
=41+0.81
=41.81。

Answer 3

14.56+25.4+1.85
=(14+25+1)+(0.56+0.4+0.85)
=40+(0.96+0.85)
=40+1.00+0.81
41+0.81
=41.81

Answer 4

先把整数加起来，14+25+1=14+1+25=15+25=40
再把小数加起来，0.56+0.4+0.85=0.96+0.85=1.81
再把整数求得和加上小数求得和，40+1.81=41.81

Answer 5

14.56+25.4+1.85
＝14.56+25.44+1.81
＝40+1.81
＝41.81