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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
=> 41 - ( 2x - 5) = 720 : 160 = 6
=> 2x - 5 = 41 - 6
=> 2x - 5 = 35
=>2x = 40
=> x = 20
Vậy x = 20
Ta co:
720:[41-(2x-5)]=120
41-(2x-5) = 720 : 120
41 - (2x-5) = 6
2x - 5 = 41 -6
2x -5 = 35
2x = 35 +5
2x = 40
x = 40 :2
x =20
Vậy x bằng 20
720 : [ 41 - (2x - 5)] = 23 . 5
=> 720 : [ 41 - ( 2x - 5)] = 40
=> 41 - (2x - 5) = 18
=> 2x - 5 = 23
=> 2x = 28
=> x = 14
Vậy x = 14
=> (41-2x-5)=720:40
=> (41-2x-5)=18
=> 41-2x=23
=> 2x=18=>x=9
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
\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(720:\left[41-\left(2x-5\right)\right]=8.5\)
\(720:\left[41-\left(2x-5\right)\right]=40\)
\(41-\left(2x-5\right)=720:40\)
\(41-\left(2x-5\right)=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28:2\)
\(x=14\)
Học tốt!
a ) (x+1)+...+(x+100)
= (x+x+..+x)+(1+..+100)
=100x + (100+1).100:2
=100x + 5050
=5750
<=> 100x = 5750 - 5050
<=> 100x = 700
=> x = 700 : 100 = 7
b) 720 : [ 41-(2x-5)]= 40
41-(2x-5) = 720 : 40
41-(2x-5) = 18
2x-5 = 41-18= 23
2x = 23+5 = 28
=> x = 28:2 = 14
Chúc Bạn Học Tốt
Nếu sai thì thông cảm ạ
720 : [ 41 - ( 2x - 5 )] = 23.5
720: [41-(2x-5)]=40
41-(2x-5)=720:40=18
2x-5=41-18=23
2x=23+5=28
x=28:2=14
tick nha có nhiều cái làm tắt á
a) 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
b) x+(x+1)+(x+2)+......+(x+30)=1240
x+x+1+x+2+...+x+30=1240
(x+x+x+....+x) + (1+2+3+....30)=1240
31*x + \(\frac{\left(30+1\right)\cdot30}{2}\)=1240
31*x + 465 =1240
31*x=1240-465
31*x =775
x = 775:31
x=25
tick mình nhé
\(720:\left(41-2x-5\right)=23,5\)
<=> \(41-2x-5=\frac{1440}{47}\)
<=> \(x=2,680851064\)
\(720:\left(41-2x-5\right)=23,5\)
\(\Leftrightarrow720:36-720:2x=23,5\)
\(\Leftrightarrow20-720:2x=23,5\)
\(\Leftrightarrow-720:2x=23,5-20\)
\(\Leftrightarrow-720:2x=3,5\)
\(\Leftrightarrow2x=\frac{-1440}{7}\)
\(\Leftrightarrow x=\frac{-720}{7}\)