720 : [41-(2x-5)]:5=4
(2x-4).(3-x) 720 : [ 41-(2x-5)]=22.5 15-x=7-(-2)
tim x
a, ( 2x - 4 ) ^ 3 = 8
b, 720 / [ 41 - ( 2x - 5 ) ] = 2^3 * 5
(2x - 4)3 = 8
(2x - 4)3 = 23
2x - 4 = 2
2x = 2 + 4
2x = 6
x = 6 : 2
x = 3
\(\frac{720}{41-\left(2x-5\right)}=2^3\times5\)
\(\frac{720}{41-2x+5}=8\times5\)
\(46-2x=\frac{720}{40}\)
\(2x=46-18\)
2x = 28
x = 28 : 2
x = 14
720÷[41-(2x+5)]=2²×5
\(\Leftrightarrow36-2x=36\)
=>x=0
720÷[41-(2x+5)]=2³×5
720: [41-(2x+5)]=8 x 5
720:[41-(2x+5)]=40
41-(2x+5)=720:40
41-(2x+5)=18
2x+5=41-18
2x+5=23
2x =23-5
2x =18
x =18:2
x =9
720 : [ 41 - ( 2x - 5 ) = 2^2 . 5
\(\Leftrightarrow41-2x+5=720:20=36\)
=>-2x=0
hay x=0
d) 720:[41-(2x-5)]=2³.5
720 : [41 - (2x - 5)] = 2³.5
720 : [41 - (2x - 5)] = 8.5
720 : [41 - (2x - 5)] = 40
41 - (2x - 5) = 720 : 40
41 - (2x - 5) = 18
2x - 5 = 41 - 18
2x - 5 = 23
2x = 23 + 5
2x = 28
x = 28 : 2
x = 14
\(720:\left[41-\left(2x-5\right)\right]=2^3\cdot5\)
\(\Rightarrow720:\left(41-2x+5\right)=8\cdot5\)
\(\Rightarrow720:\left(46-2x\right)=40\)
\(\Rightarrow46-2x=720:40\)
\(\Rightarrow46-2x=18\)
\(\Rightarrow2x=46-18\)
\(\Rightarrow2x=28\)
\(\Rightarrow x=28:2\)
\(\Rightarrow x=14\)
`@` `\text {Ans}`
`\downarrow`
`d)`
`720 \div [41 - (2x - 5)] = 2^3 * 5`
`=> 720 \div [41 - (2x - 5)] = 40`
`=> 41 - (2x - 5) = 720 \div 40`
`=> 41 - (2x - 5) = 18`
`=> 2x - 5 = 41 - 18`
`=> 2x - 5 = 23`
`=> 2x = 23 + 5`
`=> 2x = 28`
`=> x = 28 \div 2`
`=> x = 14`
Vậy, `x = 14.`
Tìm x thuộc Z
a. 720 : [ 41 - ( 2x - 5 ) ] = 2^3 . 5
b. ( 3x - 2^4 ) . 7^4 = 2.7^5
720 : [ 41 - ( 2x - 5 ) ] = 23 . 5
720 : [ 41 - ( 2x - 5 ) ] = 40
[ 41 - ( 2x - 5 ) ] = 720 : 40
41 - ( 2x - 5 ) = 18
2x - 5 = 41 - 18
2x - 5 = 23
2x = 23 + 5
2x = 28
x = 28 : 2
x = 14
Vậy x = 14
a. 720 : [ 41 - ( 2x - 5 ) ] = 23 . 5
=> 720 : [ 41 - (2x-5) ] = 8.5
=> 720 : [ 41 - (2x-5) ] = 40
=> 41 - (2x-5) = 720 : 40
=> 41 - (2x-5) = 18
=> 2x - 5 = 41 - 18
=> 2x - 5 = 23
=> 2x = 23 + 5
=> 2x = 28
=> x = 28 : 2
=> x = 14 thuộc Z
vậy______
b. ( 3x - 24 ) . 74 = 2.75
=> 3x-16 = 2.75 : 74
=> 3x - 16 = 2.7
=> 3x - 16 = 14
=> 3x = 14 + 16
=> 3x = 30
=> x = 30 : 3
=> x = 10 thuộc Z
vậy_____
( 3x - 24 ) . 74 = 2 . 75
3x - 16 = 2 . 75 : 74
3x - 16 = 2 . 7
3x - 16 = 14
3x = 14 + 16
3x = 30
x = 30 : 3
x = 10
Vậy x = 10
720 : [ 41 - (2x - 5) ] = 8 . 5
720 : [ 41 - (2x - 5) ] = 8 . 5
x=14
đảm bảo đúng 100% nếu sai cứ bảo mình
k mình nha^_^
720 : [41 - (2x - 5)] = 8 . 5
720 : [41 - (2x - 5)] = 40
[41 - (2x - 5)] = 720 : 40
41 - (2x - 5) = 18
(2x - 5) = 41 - 18
2x - 5 = 23
2x = 23 + 5
2x = 28
x = 28 : 2
x = 14
720:[41-(2x-5)]=40
=>[41-(2x-5)]=18
=>(2x-5)=41-18
=>(2x-5)=33
=>2x=33+5
=>2x=38
=>x=19
720:[ 41-(2x-5)]=2mu 3 . 5
\(720:[41-\left(2x-5\right)]=2^3.5\)
\(720:[41-\left(2x-5\right)]=8.5\)
\(720:[41-\left(2x-5\right)]=40\)
\(41-\left(2x-5\right)=720:40\)
\(41-\left(2x-5\right)=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28:2\)
\(x=14\)