bài 1 thực hiện phep tính một cách hợp lí nhất 33,76+19,52+6,24 32,79+ 68.79 $\frac{8}{11}$ + ( $\frac{16}{13}$ + $\frac{3}{11}$ ) $\frac{3}{5}$

`33,76 + 19,52 + 6,24`

`= ( 33.76 + 6,24) + 19,52`

`= 40 + 19,52`

`= 59.52`

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`32,79+ 68.79`

`= ( 32 + 0,79) + ( 68 + 0,79)`

`= ( 32 + 68) + ( 0,79 + 0,79)`

`= 100 + 1,58`

`= 101,58`

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`8/11 + (16/13+ 3/11)`

`= 8/11 +  16/13 + 3/11`

`= ( 8/11 + 3/11) + 16/13`

`= 1 + 16/13`

`= 13/13 + 16/13`

`= 29/13`

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`3/5 : 3/4 – 1/5`

`= 3/5 . 4/3 – 1/5`

`= \frac{3.4}{5.3} – 1/5`

`= 4/5 – 1/5`

`= 3/5`