问题 计算题
用简便算法计算下列各题。
(1)7.04+8.73+12.96(2)8.94+6.8+1.06+13.2

(3)4.308+4.298-3.308

(4)17-5.47-4.53
(5)9.93+7.29-5.93(6)8.47-4.397+4.397
(7)6.87+2.8+3.13+7.2(8)7-0.715-0.285
答案

(1)原式=7.04+12.96+8.73

                =20+8.73

                =28.73(2)原式=8.94+1.06+(6.8+13.2)

                =10+20

                =30

(3)原式= 4.308-3.308+4.298

                =1+4.298

                =5.298

(4)原式=17-(5.47+4.53)

                =17-10

                =7

(5)原式=9.93-5.93+7.29

                = 4+7.29

                =11.29(6)原式=8.47+(4.397-4.397)

                =8.47+0

                =8.47

(7)原式=6.87+3.13+(2.8+7.2)

                =10+10

                =20(8)原式=7-(0.715+0.285)

                =7-1

                =6

单项选择题
单项选择题