tính : 2^3.5^3-3{ 400-[673-2^3(7^8.7^6+7^0)]}

Question

tính : 2^3.5^3-3{ 400-[673-2^3(7^8.7^6+7^0)]}

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Adela 5 years 2021-05-23T21:50:17+00:00 2 Answers 55 views 0

Answers ( )

  1. Xavia
    0
    2021-05-23T21:51:45+00:00
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    `2^3 . 5^3-3{ 400-[673-2^3(7^8. 7^6+7^0)]}`

    `= (2.5)^3 – 3{400 – [ 673 – 8 .( 7^{8+6+0} + 1 )]}`

    `= 10^3 – 3 [400 – (673 – 8.7^14 – 8)]`

    `= 1000 – 3. (400 – 665 + 8. 7^14)`

    `= 1000 -3.(-265 + 8 . 7^14)`

    `= 1000 + 795 – 24. 7^14`

    `= 1795 – 24. 7^14`

  2. thanhcong
    0
    2021-05-23T21:52:15+00:00
    Reply

    Đáp án: `1795-24.7^{14}`

    Giải thích các bước giải:

        `2^3 .5^3-3{ 400-[673-2^3(7^8 .7^6+7^0)]}`

    `=  (2.5)³ -3{400-[673-8(7^{14}+1)]}`

    `= 10³ -3[400-(673-8.7^{14}-8)]`

    `= 1000 -3[400-(665-8.7^{14})]`

    `= 1000-3(400-665+8.7^{14})`

    `= 1000 -3(-265 +8.7^{14})`

    `= 1000 +795 -24.7^{14}`

    `= 1795-24.7^{14}`

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