## Bài 1:Tìm x: a) (17x – 25) : 8 + 65 = 9 ² b)2010 mũ 5 (x -60)=2010 mũ 6 c)720 :[41-(2x-5)=2 ³,5 d)80-(4.5 ² -3,2 ³)=2 mũ 10 -(x-5) e)5(12-x)-20=30 g)

Question

Bài 1:Tìm x:
a) (17x – 25) : 8 + 65 = 9 ²
b)2010 mũ 5 (x -60)=2010 mũ 6
c)720 :[41-(2x-5)=2 ³,5
d)80-(4.5 ² -3,2 ³)=2 mũ 10 -(x-5)
e)5(12-x)-20=30
g) (50 -6x).18=2 ³ .3 ² .5

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2 years 2020-10-18T12:19:51+00:00 1 Answers 103 views 0

`a) (17x – 25) : 8 + 65 = 9^2`

`=> (17x – 25) : 8 + 65 = 81`

`=> (17x – 25) : 8 = 16`

`=> 17x – 25 = 128`

`=> 17x = 153`

`=> x = 9`

Vậy `x=9`

`b)2010^5.(x -60)=2010^6`

`=> x-60 = 2010^6 : 2010^5`

`=> x-60 = 2010`

`=> x = 2070`

Vậy `x= 2070`

`c)720 :[41-(2x-5)]=2^(3).5`

`=> 720 :[41-(2x-5)]= 40`

`=> 41-(2x-5) = 18`

`=> 2x-5 = 23`

`=> 2x = 28`

`=> x =14`

Vậy `x=14`

`d)80-(4.5 ² -3.2 ³)=2^10 -(x-5)`

`=> 80-(4.25 – 3.8) = 1024 – (x-5)`

`=> 80 – 76 = 1024 – (x-5)`

`=> 4 = 1024 – (x-5)`

`=> x-5 = 1020`

`=> x = 1025`

Vậy `x=1025`

`e)5(12-x)-20=30`

`=> 5(12-x) = 10`

`=> 12-x = 2`

`=> x =10`

Vậy `x=10`

`g) (50 -6x).18=2 ³ .3 ² .5`

`=>(50 -6x).18=8.9.5`

`=> (50 -6x).18 = 360`

`=> 50-6x = 20`

`=> 6x = 30`

`=> x = 5`

Vậy `x=5`

`~Go od luck !~`