tìm x biết [ 41 -(2x -5)] = 2^3.5
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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
\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=40\)
\(\Leftrightarrow41-\left(2x-5\right)=720:40\)
\(\Leftrightarrow41-\left(2x-5\right)=18\)
\(\Leftrightarrow2x-5=41-18\)
\(\Leftrightarrow2x-5=23\)
\(\Leftrightarrow2x=28\)
\(\Leftrightarrow x=14\)
Ta có :\(720:\left[41-\left(2X-5\right)\right]=2^3\cdot5\)
\(\Leftrightarrow41-\left(2X-5\right)=18\)
\(\Leftrightarrow2X-5=23\)
\(\Leftrightarrow2X=28\)
\(\Leftrightarrow X=14\)(TMĐK)
Vậy X= 14 là giá trụ cần tìm.
\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(720:\left[41-\left(2x-5\right)\right]=8.5\)
\(720:\left[41-\left(2x-5\right)\right]=40\)
\(41-\left(2x-5\right)=720:40\)
\(41- \left(2x-5\right)=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28:2\)
\(\Rightarrow x=14\)
Bài 1: 25 + 3(x - 8) = 106
3(x - 8) = 106 - 25
3(x - 8) = 81
(x - 8) = 81 : 3
(x - 8) = 27
x = 27 + 8
x = 25
Bài 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
a, vì : 32 = 9
=> x - 6 = 3
=> x = 9
b, 720 : [ 41 - ( 2x - 5 ) ] = 40
41 - ( 2x - 5 ) = 720 : 40 = 18
2x - 5 = 41 - 18 = 23
2x = 23 + 5 = 28
x = 28 : 2 = 14
c, ( 4x + 28 ) . 3 + 55 = 35 . 5 = 175
( 4x + 28 ) . 3 = 175 - 55 = 120
4x + 28 = 120 : 3 = 40
4x = 40 - 28 = 12
x = 12 : 4 = 3
**** GIÙM MK NHA , TKS
a, \(3^2\left(x+14\right)-5^2=5.4\)
\(\Rightarrow9\left(x+14\right)-25=20\)
\(\Rightarrow9x+126=20+25\)
\(\Rightarrow9x+126=45\)
\(\Rightarrow9x=45-126\)
\(\Rightarrow9x=-81\Rightarrow x=-9\)
Vậy x = 9
a,\(3^2\left(x+14\right)-5^2=5.4\)
\(\Rightarrow9\left(x-14\right)-25=20\)
\(\Rightarrow9\left(x-14\right)=20+25=45\)
\(\Rightarrow x-14=45:9=5\)
\(\Rightarrow x=5+14\)
\(\Rightarrow x=19\)
Vậy x = 19
b,\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(720:\left[41-2x+5\right]=40\)
\(\Rightarrow41+5-2x=720:40\)
\(\Rightarrow46-2x=18\)
\(\Rightarrow2x=46-18=28\)
\(\Rightarrow x=28:2\)
\(\Rightarrow x=14\)
Vậy x = 14
~Study well~
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
Trần Anh Dũng
b) \(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(720:\left[41-2x+5\right]=40\)
\(46-2x=720:40\)
\(46-2x=18\)
\(2x=28\)
\(x=14\)
vậy \(x=14\)
a) \(2^x+2-2^x=96\)
\(0^x=96-2\)
\(0^x=94\)
\(\Rightarrow x\in\varnothing\)
vậy \(x\in\varnothing\)
c) \(16^x< 128^4\)
\(2^{4x}< 2^{28}\)
\(\Rightarrow4x< 28\)
\(\Rightarrow x< 7\)
vậy \(x< 7\)
a, Ta có \(2^{x+2}-2^x=96\)
\(\Rightarrow2^x.2^2-2^x=96\)
\(\Rightarrow2^x.\left(2^2-1\right)=96\)
\(\Rightarrow2^x.3=96\)
\(\Rightarrow2^x=32\)
\(\Rightarrow2^x=2^5\)
\(\Rightarrow x=5\)
b, \(720:\left[51-\left(2x-5\right)\right]=2^3.5\)
\(\Rightarrow720:\left[51-\left(2x-5\right)\right]=40\)
\(\Rightarrow\left[51-\left(2x-5\right)\right]=18\)
\(\Rightarrow2x-5=33\)
\(\Rightarrow2x=38\)
\(\Rightarrow x=19\)
c,\(16^x< 128^4\)
\(\Rightarrow\left(2^4\right)^x< \left(2^7\right)^4\)
\(\Rightarrow\left(2^4\right)^x< \left(2^4\right)^7\)
\(\Rightarrow x< 7\)
[ 41 -(2x -5)] = 2^3.5
[ 41 -(2x -5)] = 8.5
[ 41 -(2x -5)] = 40
2x -5= 41 - 40
2x -5 = 1
2x = 1 + 5
2x = 6
x = 6 : 2
x = 3
HOk tốt
\(41-\left(2x-5\right)=2^3.5\)
\(\Rightarrow41-\left(2x-5\right)=8.5\)
\(\Rightarrow41-\left(2x-5\right)=40\)
\(\Rightarrow2x-5=41-40\)
\(\Rightarrow2x-5=1\)
\(\Rightarrow2x=1+5\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=6:2\)
\(\Rightarrow x=3\)
Vậy x = 3
_Chúc bạn học tốt_