用简便方法计算。
25
× 817
+ 25
× 917
518
×33- 518
÷133
38
×7+1÷ 83
14
+ 25
+ 34
+ 35
(25
+ 13
)×15
(724
- 316
)÷ 18
713
× 45
+ 613
÷ 54
29
÷ 19
+ 79
÷ 19
1- 211
÷ 811
- 34
34
×88+ 14
÷ 188
(12
+ 13
- 16
)×24
20-20× 99100
2913
-(313
+ 57
)
2- 38
÷ 716
- 17
512
÷8+ 18
× 112
( 14
- 120
)×40
23
× 85
+ 13
÷ 58
25-25× 99100
4― 34
― 14
(13
- 16
+ 14
)×12
(8+ 49
)÷4