a, 457+(217-x)=589 b,96-3(x+1)=42 c,5.(x+35)=515 d,70-5(x-3)=45 e,10+2.x=4 mũ 5: 4 mũ 3

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1. Đáp án:

   bn tham khảo ko hiểu cứ nói nhé 

   Giải thích các bước giải:

   a) `457 + (217 – x) = 589`

   `=> 217 – x = 589 – 457`

   `=> 217 – x = 132`

   `=> x = 217 – 132`

   `=> x = 85`

   b) `96 – 3(x + 1) = 42`

   `=> 3(x + 1) = 96 – 42`

   `=> 3(x + 1) = 54`

   `=> x + 1 = 18`

   `=> x = 18 – 1 = 17`

   c) `5(x + 35) = 515`

   `=> x + 35 = 515 : 5`

   `=> x + 35 = 103`

   `=> x = 103 – 35 = 68`

   d) `70 – 5(x – 3) = 45`

   `=> 5(x – 3) = 70 – 45`

   `=> 5(x – 3) = 25`

   `=> x – 3 = 5`

   `=> x = 5 + 3 = 8`

   e) `10 + 2 . x = 4^5 : 4^3`

   `=> 10 + 2 . x = 4^2`

   `=> 2 . x = 4^2 – 10`

   `=> 2 . x = 6`

   `=> x = 3`

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2. `a, 457 + ( 217 – x ) = 589`

   `217 – x = 589 – 457`

   `217 – x = 132`

   `x = 217 – 132`

   `x = 85`

   `b, 96 – 3( x + 1 ) = 42`

   `3( x + 1 ) = 96 – 42`

   `3( x + 1 ) = 54`

   `x + 1 = 54 : 3`

   `x + 1 = 18`

   `x = 18 – 1`

   `x = 17`

   `c, 5 . ( x + 35 ) = 515`

   `x + 35 = 515 : 5`

   `x + 35 = 103`

   `x = 103 – 35`

   `x = 68`

   `d, 70 – 5(x-3) = 45`

   `5(x-3) = 70 – 45`

   `5(x-3) = 25`

   `x – 3 = 25 : 5`

   `x – 3 = 5`

   `x = 5 + 3`

   `x = 8`

   `e, 10 + 2x = 4^5 : 4^3`

   `10 + 2x = 16`

   `2x = 16 – 10`

   `2x = 6`

   `x = 3`.

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