Ta có :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 = 25
=> 2x = 25 + 5
=> 2x = 30
=> x = 30 : 2
=> x = 15
Vậy x = 15
720:[41-(2x-5)]=8.5
41-(2x-5)=720:40
2x-5=41-18
2x-5=23
2x=28
x=14
Vậy x=14
Mk viết 2.x là 2x nha bạn, k cho mk nha
=>[41-(2x-5)]=720:40
=>41-(2x-5)=13
=>2x-5=41-13
=>2x-5=28
=>x=(28+5):2
=>x=33/2
720:[41-(2.x-5)]=40
=>[41-(2.x-5)]=720:40
=>[41-(2.x-5)]=18
=>41-2.x+5=18
=>2.x+5=41-18
=>2.x+5=23
=>2.x=23-5
=>2.x=18
=>x=18:2=9
Vây x=9
720 : [ 41 - (2.x - 5)] = 23 . 5
720 : [41 - 2.x + 5 ] = 8 . 5
720 : [46 - 2.x] = 40
46 - 2.x = 720 : 40
46 - 2.x = 18
2.x = 46 -18
2.x = 28
x = 28 : 2
x = 14
\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(720:\left[41-\left(2x-5\right)\right]=8.5\)
\(720:\left[41-\left(2x-5\right)\right]=40\)
\(\Rightarrow\left[41-\left(2x-5\right)\right]=720:40\)
\(\Rightarrow41-\left(2x-5\right)=18\)
\(\Rightarrow\left(2x-5\right)=41-18\)
\(\Rightarrow2x-5=23\)
\(\Rightarrow2x=23+5\)
\(2x=28\)
\(x=28:2\)
\(x=14\)
Vậy \(x=14\)
Chúc bạn học tốt !!!