tính nhanh nếu có thể:115-(150-81)+(150-115)

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tính nhanh nếu có thể:115-(150-81)+(150-115)

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    Đáp án `+` Giải thích các bước giải:

    `115 – (150 – 81) + (150 – 115)`

    `= 115 – 150 + 81 + 150 – 115`

    `= (115 – 115) + (-150 + 150) + 81`

    `= 0 + 0 + 81`

    `= 81`

     

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