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
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
`Answer :`
`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 !~`