Answer :

Bài ` 1 : `

` a) 130 - 25 + 75 `

` = 105 + 75 `

` = 180 `

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` b) 20 : 5 * 2 `

` = 4 * 2 `

` = 8 `

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` c) 26 - 6 * 2 + 15 : 3 `

` = 26 - 12 + 5 `

` = 14 + 5 `

` = 19 `

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` d) 136 - 36 : 18 `

` = 136 - 2 `

` = 134 `

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` e) 15 * 141 + 59 * 15 `

` = 15 * ( 141 + 59 ) `

` = 15 * 200 `

` = 3000 `

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` f) 17 * 85 + 15 * 17 - 120 `

` = 17 * ( 85 + 15 ) - 120 `

` = 17 * 100 - 120 `

` = 1700 - 120 `

` = 1580 `

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