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Huy Gia
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Asked: Tháng Mười 26, 20202020-10-26T01:15:16+00:00 2020-10-26T01:15:16+00:00In: Môn Toán

Giúp mik vs có 2 bài thoii

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Giúp mik vs có 2 bài thoii
giup-mik-vs-co-2-bai-thoii

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    1. Dulcie

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      Dulcie
      2020-10-26T01:16:17+00:00Added an answer on Tháng Mười 26, 2020 at 1:16 sáng

      Bài 2:

      a) 47.76 + 76.54 – 76

      = 76. (47 + 54 -1)

      = 76. 100

      = 7600

      b) {[260 – (36 -31)^3 . 2] -9} . 2017

      = {[260 – 5^3 .2 ]-9 }.2017

      = {[260 – 125.2] -9}.2017

      ={[260 – 250] -9}.2017

      = {10-9}.2017

      = 1.2017

      = 2017

      c) 11. 2^3 + 3^3. 2 – 29

      = 11. 8 + 27.2 -29

      = 88 + 54 – 29

      = 113

      Bài 3:

      a) 491 – (x+83) = 336

                    x+83 = 491 – 336

                    x+83  = 155

                        x     = 155 – 83

                        x     = 72

      b) (x^2 -18) : 63 = 1

            x^2 -18         = 1. 63 = 63

            x^2                = 63+18 =81

      Mà 9^2                 = 81

      => x = 9

      c) 5^x+1 +5^x = 150

      5^x. 5 + 5^x     = 150

      5^x . (5+1)         = 150

      5^x .6                 = 150

      5^x                      =150 : 6= 25

      Mà 5^2               = 25

      => x = 5

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    2. Neala

      Neala

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      Neala
      2020-10-26T01:16:55+00:00Added an answer on Tháng Mười 26, 2020 at 1:16 sáng

      Bài 2:

      a. `47 . 76 + 76 . 54 – 76`

      `= 76 . (47 + 54 – 1)`

      `= 76 . 100 = 7600`

      b. `{[260 – (36 – 31)^3 . 2] – 9} . 2017`

      `= {[260 – 5^3 . 2] – 9} . 2017`

      `= {[260 – 250] – 9} . 2017`

      `= {10 – 9} . 2017`

      `= 1 . 2017 = 2017`

      c. `11 . 2^3 + 3^3 . 2 – 29`

      `= 11 . 8 + 27 . 2 – 29`

      `= 88 + 54 – 29`

      `= 142 – 29 = 114`

      Bài 3:

      a. `491 – (x + 83) = 336`

      `=> x + 83 = 491 – 336`

      `=> x + 83 = 155`

      `=> x = 155 – 83 = 72`

      b. `(x^2 – 18) : 63 = 1`

      `=> x^2 – 18 = 63`

      `=> x^2 = 63 + 18`

      `=> x^2 = 81`

      `=> x^2 = 9^2 = (-9)^2`

      `=> x = 9 ; x = -9`

      c. `5^(x + 1) + 5^x = 150`

      `=> 5^x . 5^1 + 5^x . 1 = 150`

      `=> 5^x . (5 + 1) = 150`

      `=> 5^x . 6 = 150`

      `=> 5^x = 25`

      `=> 5^x = 5^2`

      `=> x = 2`

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