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Đáp án:

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`a) 102 xx 6 - (343 : 7 +287)`

`= 102 xx 6 - (49 + 287)`

`= 612 - 336`

`= 276`

`b) (456 + 146 xx 4 - 388) : 4`

`= (456 + 584 - 388) : 4`

`= (1040 - 388) : 4`

`= 652 : 4`

`= 163`

`c) 225 xx (129 - 125) : 5`

`= 225 xx 4 : 5`

`= 900 : 5`

`= 180`

`d) (214 + 497) : 3 - 146`

`= 711 : 3 - 146`

`= 237 - 146`

`=91` 

Giải thích các bước giải: