Tìm x
a) 2.x-138=23.32
b) 3.2x-3=45
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2x - 23.32 = 138
2x - 72 = 138
2x = 138 + 72
2x = 200
x = 200 ÷ 2
x = 100
( 6.x - 34 ).73= 3.74
( 6x - 34 ).343 = 7203
6x - 34 = 7203 ÷ 343
6x - 34 = 21
6x = 21 + 34
6x = 55
x = 55 ÷ 6
x = 55/6
a,2x-23.32=138
2x-72=138
2x=66
x=66:2
x=33
Vậy x=33
b,(6x-34).73=3.74
(6x-34).343=7203
6x-34=21
6x=21+34
6x=55
x=55:6
x=\(\frac{55}{6}\)
Vậy x=\(\frac{55}{6}\)
\(70-5\cdot\left(x-3\right)=45\)
\(\Rightarrow5\cdot\left(x-3\right)=70-45\)
\(\Rightarrow5\cdot\left(x-3\right)=25\)
\(\Rightarrow x-3=\dfrac{25}{5}\)
\(\Rightarrow x-3=5\)
\(\Rightarrow x=5+3=8\)
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\(10+2\cdot x=4^5:4^3\)
\(\Rightarrow10+2\cdot x=4^2\)
\(\Rightarrow10+2\cdot x=16\)
\(\Rightarrow2\cdot x=16-10\)
\(\Rightarrow2\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
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\(2\cdot x-138=2^3\cdot3^2\)
\(\Rightarrow2\cdot x-138=72\)
\(\Rightarrow2\cdot x=72+138\)
\(\Rightarrow2\cdot x=210\)
\(\Rightarrow x=\dfrac{210}{2}=105\)
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\(231-\left(x-6\right)=1339:12\)
\(\Rightarrow231-x+6=1339:12\)
\(\Rightarrow237-x=\dfrac{1339}{12}\)
\(\Rightarrow x=237-\dfrac{1339}{12}\)
\(\Rightarrow x=\dfrac{1505}{12}\)
3.2x—3=45
3.2x=45+3
3.2x=48
2x=48:3
2x=16
x=16:2
x=8
4x .3+12=120
4x.3=120–12
4x.3=108
4x=108:3
4x=36
x=36:4
x=9
\(3.2x-3=45\)
\(3.2x=45+3\)
\(3.2x=48\)
\(2x=\frac{48}{3}\)
\(2x=16\)
\(x=8\)
Vậy \(x=8\)
\(1500:\left[\left(36x+40\right):x\right]=30\)
\(\left(36x+40\right):x=1500:30\)
\(36x+40=50x\)
\(50x-36x=40\)
\(14x=40\)
\(x=\frac{40}{14}\)
\(x=\frac{20}{7}\)
Vậy \(x=\frac{20}{7}\)
b) 123 - 5.(x+4) = 38
=> 5.(x+4) = 123 - 38
=> 5.(x+4) = 85
=> (x+4) = 85 : 5
=> x+4 = 17
=> x = 17 - 4
=> x = 13
c) 2.x - 138 = 23.32
=>2.x - 138 = 736
=>2.x = 736 + 138
=>2.x = 874
=> x = 874 : 2
=> x = 437
d) 70 - 5.(x-3) = 45
=> 5.(x-3) = 70 - 45
=> 5.(x-3) = 25
=> (x-3) = 25 : 5
=> x-3 = 5
=> x = 5 + 3
=> x = 8
a) 70 - 5 (x - 3) = 45
5 (x - 3) =70-45
5 (x - 3) =25
(x - 3)=25:5
(x - 3)=5
x=5+3
x=8
b) 10 + 2.x = 4^5 : 4^3
10 + 2.x=4^2
10 + 2.x=16
2.x=16-10
2.x=6
x=6:2
x=3
c) 2x - 138 = 2^3 . 3^2
2x - 138 = 8.9
2x - 138 = 72
2x=72+138
2x=210
x=210:2
x=105
d) 231 - (x - 6) = 133 : 13
(đề sai)
a: =>2x+10=4^2=16
=>2x=6
=>x=3
b: =>2x-138=8*9=72
=>2x=138+72=210
=>x=105
c: =>231-(x-6)=103
=>x-6=128
=>x=134
\(a.10+2x=4^5:4^3\\ \Leftrightarrow10+2x=4^2\\ \Leftrightarrow2x=6\\ \Leftrightarrow x=3\)
\(b.2x-138=2^3.3^2\\ \Leftrightarrow2x-138=72\\ \Leftrightarrow x=210:2\\ \Leftrightarrow x=105\)
\(c.231-\left(x-6\right)=1339:13\\ \Leftrightarrow231-\left(x-6\right)=103\\ \Leftrightarrow x-6=128\\ \Leftrightarrow x=134\)
Chú ý : Nếu bạn chưa học \(\Leftrightarrow\) thì bạn bỏ đi nha !
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 70-5(x-3)=45
5(x-3)=70-45
5(x-3)=25
x-3=25:5
x-3=5
x=5+3
x=8
c 2.x-138=8.9
2.x-138=72
2.x=138+72
2.x=210
x=210:2
x=105
720 : [ 41 -(2X -50)] = 40
41 - (2X - 50) = 720 : 40
41 - (2X - 50) = 18
2X - 50 = 41 - 18
2X - 50 = 23
2X = 23 + 50
2X = 73
2X = 73 :2
2X = 36,5
70 - 5 . (X - 3) = 50
5 . (X -3 ) = 70 - 50
5 . (X - 3) = 20
X - 3 = 20 : 5
X - 3 = 4
X = 4 + 3
X = 7
2.X - 138 = 23 .5
2.X - 138 = 40
2.X - = 40 + 138
2.X = 178
X = 178 : 2
X = 89
a,70 – 5.(x – 3) = 45
5.(x -3) = 70 - 45
5.(x – 3) = 25
x – 3 = 25 : 5
x – 3 = 5
x = 5 + 3
x = 8
Vậy x = 8
b,\(2x-138=8x9=72\)
\(2x=138+72=210\)
\(x=210:2=105\)
c,\(10+2x=4^2\)\(=16\)
\(2x=16-10=6\)
\(x=6:2=3\)
d, 231 – (x- 6) = 1339 : 13
231 – (x – 6) = 103
x – 6 = 231 – 103
x – 6 = 128
x = 128 + 6
x = 134
Vậy x = 134
2x - 138 = 23 . 32
2x - 138 = 72
2x = 72 + 138
2x = 210
x = 105
10 + 2x = 45 : 43
10 + 2x = 16
2x = 16 - 10
2x = 6
x= 3
TL
a ) 2x-138 =23.32
2x-138=72
2x =72+138
2x =210
x =210:2
x =105
b ) 3.2x −3=453.2x -3=45
⇒3.2x =45+3⇒3.2x =45+3
⇒3.2x =48⇒3.2x =48
⇒2x =48:3⇒2x =48:3
⇒2x =16⇒2x =16
Ta thấy: 24 =1624 =16
⇒2x =24⇒2x =24
⇒x=4⇒x=4
Vậy x=4x=4
HT
TL
a, 2.x-138=72
2.x=72+138
2.x=110
x=210:2
x=105
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