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720 : [(5 - 2x) - (-41)] = 23 . 5
720 : [(5 - 2x) + 41] = 8 . 5
720 : [(5 - 2x) + 41] = 40
(5 - 2x) + 41 = 720 : 40
(5 - 2x) + 41 = 18
5 - 2x = 18 - 41
5 - 2x = -23
2x = 5 - (-23) = 5 + 23
2x = 28
x = 28 : 2 = 14
=> x = 14
Bài 1: \(5^3+3^5\)
=125+243
=368
Bài 2:
a: \(\left(x-1\right)^3=125\)
=>\(\left(x-1\right)^3=5^3\)
=>x-1=5
=>x=6
b: \(\frac{720}{41-\left(2x-5\right)}=2^3\cdot5\)
=>\(\frac{720}{41-\left(2x-5\right)}=8\cdot5=40\)
=>41-(2x-5)=720/40=18
=>2x-5=23
=>2x=28
=>x=14
Bài 3:
a: \(\frac19\cdot3^4\cdot3^{n}=3^7\)
=>\(3^{n+4-2}=3^7\)
=>n+4-2=7
=>n+2=7
=>n=5
b: \(\left(2^2:4\right)\cdot2^{n}=4\)
=>\(\frac44\cdot2^{n}=4\)
=>\(2^{n}=4=2^2\)
=>n=2
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
Vậy x=14
720:[41-(2x-5)]=2^3.5
720:[41-2x+5]=40
[41+5-2x]=720:40
46-2x=18
2x=46-18
2x=28
x=14
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
2.x=23+5
2.x=28
x=28:2
x=14
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 : [ 41 - ( 2 x - 5 ) ] = 40
41 - ( 2 x - 5 ) = 720 : 40
41 - ( 2 x - 5 ) = 18
2 x - 5 = 41 - 18
2 x - 5 = 23
2 x = 23 + 5
2 x = 28
x = 28 : 2
x = 14
\(720:[41-\left(2x-5\right)]=2^3.5\)
\(720:[41-\left(2x-5\right)]=8.5\)
\(720:[41-\left(2x-5\right)]=40\)
\(41-\left(2x-5\right)=720:40\)
\(41-\left(2x-5\right)=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28:2\)
\(x=14\)