早教吧 育儿知识 作业答案 考试题库 百科 知识分享

怎样简便怎样算.484+389+37+128685+89+115+211125×32×2565×23+35×23102×4478×99+78265×105-265×5267×8+267×5-2

题目详情
怎样简便怎样算.
484+389+37+128     685+89+115+211      
125×32×25 65×23+35×23       
102×44           78×99+78
265×105-265×5       267×8+267×5-267×3.
▼优质解答
答案和解析
(1)484+389+37+128
=500-16+400-11+40-3+100+28
=500+400+40+100-16-11-3+28
=1040-27-3+28
=1010+28
=1038

(2)125×32×25
=125×8×4×25
=1000×100
=100000

(3)102×44
=(100+2)×44
=100×44+2×44
=4400+88
=4488

(4)265×105-265×5
=265×(105-5)
=265×100
=26500

(5)685+89+115+211
=685+115+89+211
=800+300
=1100

(6)65×23+35×23
=(65+35)×23
=100×23
=2300

(7)78×99+78
=78×99+78×1
=78×(99+1)
=78×100
=7800

(8)267×8+267×5-267×3
=267×(8+5-3)
=267×10
=2670