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Đáp án:

Bài `2`:

`a) 18,65 + 281,35 - 26,75 - 13,25`

` = ( 18,65 + 281,35) - ( 26,75 + 13,25)`

` = 300 - 40`

` = 260`

`b) 38,25 - 18,25 + 21,64 - 11,64 + 9,93`

` = ( 38,25 - 18,25) + (21,65 - 11,64) + 9,93`

` = 20 + 10 + 9,93`

` = 30 + 9,93`

` = 39,93`

`c) (72,69 + 18,47) - (8,47 + 22,69)`

` = 72,69 + 18,47 - 8,47 - 22,69`

` = (72,69 - 22,69) + (18,47 - 8,47)`

` = 50 + 10`

` = 60`

`d) 114,02 - (114,37 - 85,98)`

` = 114,02 - 114,37 + 85,98`

` = ( 114,02 + 85,98) - 114,37`

` = 200 - 114,37`

` = 85,63`