Question

递等式计算（能简便的要简便）

(0.8-0.1)×(7-5.99)÷0.01 9.6÷1.6÷0.16×0.01 [0.15＋﹙3.74-1.8﹚]÷0.11×40.5 ﹙73.45－37.54＋34.75﹚÷0.02
(0.8-0.1)×(7-5.99)÷0.01
9.6÷1.6÷0.16×0.01
[0.15＋﹙3.74-1.8﹚]÷0.11×40.5
﹙73.45－37.54＋34.75﹚÷0.02

Answer 1

(0.8-0.1)×(7-5.99)÷0.01
=0.7×1.01×100
=0.7×101
=70.7
9.6÷1.6÷0.16×0.01
=6÷0.16×0.01
=37.5×0.01
=0.375
[0.15＋﹙3.74-1.8﹚]÷0.11×40.5
=（0.15+1.94）÷0.11×40.5
=2.09÷0.11×40.5
=19×40.5
=769.5
﹙73.45－37.54＋34.75﹚÷0.02
=（73.45+34.75-37.54）÷0.02
=（108.2-37.54）×50
=70.66×50
=3533

追问

哪些题能简便运算

追答

(0.8-0.1)×(7-5.99)÷0.01
=0.7×(1.01×100)这一步
=0.7×101
=70.7

[0.15＋﹙3.74-1.8﹚]÷0.11×40.5
=（0.15+1.94）÷0.11×40.5
=（2.09÷0.11）×40.5这一步
=19×40.5
=（20-1）×40.5 这一步
=810-40.5

﹙73.45－37.54＋34.75﹚÷0.02
=（73.45+34.75-37.54）÷0.02 加法交换律
=（108.2-37.54）×50
【=108.2×50-37.54×50=5410-1877=3533】这一步
=70.66×50
=3533

这些题目，基本不能简算。。。
=769.5