a) (108-24) -108 b)-34+(84-34) c) -(32 -2019) -2019 d) (x-13) -(x+ 17) e) 25. (-2022)+ [(-25).(-2022)-74] tinh nhanh

Đáp án:

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`a) (108 - 24) - 108`

`= 108 - 24 - 108`

`= (108 - 108) -24`

`= 0 -24`

`= -24`

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`b) -34 + (84 - 34)`

`= -34 + 84 - 34`

`= [(-34) + (-34)] + 84`

`= -68 + 84`

`= 16`

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`c) -(32 - 2019) - 2019`

`= -32 + 2019 - 2019`

`= -32 + (2019 - 2019)`

`= -32 + 0`

`= -32`

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`e) 25.(-2022) + [(-25) .(-2022) - 74]`

`= 25.(-2022) + (-25).(-2022) - 74`

`= (-2022) . [25 + (-25)] - 74`

`= (-2022) . 0 - 74`

`= 0-74`

`= -74`

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`d) (x-13) - (x+17)`

`= x-13 - x - 17`

`= (x-x) + [(-13) + (-17)]`

`= -30`

Giải thích các bước giải: