Đáp án + Giải thích các bước giải:

 `c)` `(2+3/5-7/9)-(2-7/9)+(2024-3/5)`

`=2+3/5-7/9-2+7/9+2024-3/5`

`=[3/5+(-3/5)]+(2-2)+[(-7/9)+7/9]+2024`

`=0+0+0+2024`

`=2024`

`d)` `[2/3+(-1/4)-(-2)².` `3/4]-1`

`=[5/12-4.` `3/4]-1`

`=[5/12-3]-1`

`=(-31/12)-1`

`=-43/12`

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