Question

1. Tìm x biết : a) ( 17x - 25 ) : 8 + 65 = 9 mũ 2 ; b) 2022 mũ 5 ( x - 60 ) = 2022 mũ 6 . 2. Tính : a) 3 mũ 2 . 7 ( 1 mũ 10 + 24 ) : 5 mũ 2 ; b) 25 . {22 .[12 - 4 + 4(16 : 2 mũ 3 ) ] }

 

 

 

Answer 1

`1)`

`a)(17x-25):8+65=9^2`

`(17x-25):8+65=81`

`(17x-25):8=81-65=16`

`17x-25=16xx8=128`

`17x=128+25=153`

`x=153:17=9`

`b)2022^5 (x-60)=2022^6`

`x-60=2022^6 :2022^5`

`x-60=2022`

`x=2022+60=2082`

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`2)`

`a)3^2 .7(1^10+24):5^2`

`=9.7(1+24):25`

`=9.7.25:25=9.7=63`

`b)25.{22.[12-4+4(16:2^3)]}`

`=25.{22.[8+4(16:8)]}`

`=25.[22.(8+4.2)]`

`=25.[22.(8+8)]`

`=25.(22.16)`

`=25.352=8800`

Answer 2

\(a)\left(17x-25\right):8+65=9^2\)

\(\left(17x-25\right):8=81-65\)

\(\left(17x-25\right):8=16\)

\(\left(17x-25\right)=16.8\)

\(\left(17x-25\right)=128\)

\(17x=128+25\)

\(17x=153\)

\(x=153:17\)

\(x=9\)

\(b)2022^5\left(x-60\right)=2022^6\)

\(x-60=2022^6:2022^5\)

\(x-60=2022^1\)

\(x=2022+60\)

\(x=2082\)

\(2,\)

\(a)3^2.7\left(1^{10}+24\right):5^2\)

\(=9.7.25:25\)

\(=63.1\)

\(=63\)

\(b)25.\left\{22.\left[12-4+4\left(16:2^3\right)\right]\right\}\)

\(=25.\left\{22.\left[12-4+4.2\right]\right\}\)

\(=25.\left\{22.\left[12-4+8\right]\right\}\)

\(=25.\left\{22.\left[8+8\right]\right\}\)

\(=25.\left\{22.16\right\}\)

\(=25.352\)

\(=8800\)