Question

求4-2.46+3.87和2.65×0.8-1.36两道题的简便运算过程

谢谢

Answer 1

解：可以化整求解
第一题:
4-2.46+3.87
=4-2+3+0.87-0.46
=5+0.41
=5.41
第二题：
2.65*0.8-1.36
=2.65*4/5-1.36
=0.53*4-1.36
=2.12-1.36
=0.76

Answer 2

4-2.46+3.87=4-2+3+（0.87-0.46）=5+0.41=5.41
2.65×0.8-1.36=2.65×（1-0.2）-1.36=2.65-2.65×0.2-1.36=2.65-0.53-1.36=2.12-1.36=0.76

Answer 3

4-2.46+3.87
=4-2.46+3.46+0.41
=4+1.00+0.41
=5.41
2.65×0.8-1.36
=(2.25+0.4)×0.8-1.36
=1.8+0.32-1.36
=1.8-1.04
=0.76