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a
(6x-39):3=201
<<=>6x-39=603
<=>6x=642
<=>107
b
23+3x=5^6:5^3
<=>23+3x=5^3
<=>23+3x=125
<=>3x=102
<=>x=34
c
12.x-33=3^2.3^3
<=>12x-33=243
<=>12x=276
<=>x=23
\(5x+2x=6^2-5^0\Leftrightarrow5x+2x=6^2-1\)
\(\Leftrightarrow5x-2x=36-1\Leftrightarrow5x-2x=35\Leftrightarrow x\left(5+2\right)=35\)
\(\Leftrightarrow7x=35\Leftrightarrow x=35:7\Leftrightarrow x=5\)
\(5x+x=150:2+3\Leftrightarrow5x+x=75+3\)
\(\Leftrightarrow5x+x=78\Leftrightarrow x\left(5+1\right)=78\Leftrightarrow x6=78\)
\(\Leftrightarrow x=78:6\Leftrightarrow x=13\)
a) 5x + 2x = 62 - 50
7x = 35 => x = 5
b) 5x + x = 150 : 2 + 3
6x = 78 => x = 13
c) 6x + x = 511 : 59 + 31
7x = 28 => x = 4
d) 5x + 3x = 36 : 33 x 4 + 12
8x = 120 => x = 15
e) 4x + 2x = 68 - 219 : 216
6x = 60 => x = 10
f) 5x + x = 39 - 311 : 39
6x = 30 => x = 5
g) 7x - x = 521 : 519 + 3 x 22 - 70
6x = 36 => x = 6
h) 7x - 2x = 617 : 615 + 44 : 11
5x = 40 => x = 8
a. 8x+2x =25. 2 mũ 2
8x+2x=100
(8+2)x=100
10x=100
x=100:10
x=10
b.5x+2x=35
(5+2)x=35
7x=35
x=35:7
x=5
Sửa:
(6x-39):3=201
6x-39=201.3
6x-39=603
6x=603+39
6x=642
x=107
23+3x=5^6:5^3
23+3x=5^3=125
3x=125-23
3x=102
x=102:3
x=34
a) 8x + 2x = 25 . 22
8x + 2x = 100
( 8 + 2 )x = 100
10x = 100
x = 100 : 10
x = 10
b) 5x + 2x = 35
( 5 + 2 )x = 35
7x = 35
x = 35 : 7
x = 5
c) 5x + x = 150 : 2 + 3
5x + x = 75 + 3
5x + x = 78
( 5 + 1 )x = 78
6x = 78
x = 78 : 6
x = 13
d) 6x + x = 511 : 59 + 31
6x + x = 52 + 31
6x + x = 25 + 3
6x + x = 28
( 6 + 1 )x = 28
7x = 28
x = 28 : 7
x = 4
e) 5x + 3x = 36 : 33 . 4 + 12
5x + 3x = 33 . 4 + 12
5x + 3x = 27 . 4 + 12
5x + 3x = 108 + 12
5x + 3x = 120
( 5 + 3 )x = 120
8x = 120
x = 120 : 8
x = 15
1/ 3(x - 2) = 9 => x - 2 = 3 => x = 5
2/ 3(x - 36) = 216 => x - 36 = 72 => x = 108
3/ (x - 3)3 = 33 => x - 3 = 3 => x = 6
4/ 2x = 32 => 2x = 25 => x = 5
5/ 3x - 16 = 2.74 : 73 = 14 => 3x = 30 => x = 10
6/ (6x - 39) : 3 = 201 => 6x - 39 = 603 => 6x = 642 => x = 107
7/ (3x - 15)2 = 81 => (3x - 15)2 = 92 => 3x - 15 = 9 => 3x = 24 => x = 8
8/ 3(x + 4) = 105 => x + 4 = 35 => x = 31
9/ 12x - 43 = 4.84 : 83 = 32 => 12x = 32 : 64 => 12x = 1/2 => x = 1/24
10/ 41 - (2x - 5) = 680 => 2x - 5 = -639 => 2x = -634 => x = - 317
\(5x+2x=6^2-5^0\)
\(7x=36-1\)
\(7x=35\)
\(x=5\)
vậy \(x=5\)
\(5x+x=150:2+3\)
\(6x=75+3\)
\(x=78:6\)
\(x=13\)
vậy \(x=13\)
những câu sau tương tự
1) 5x + 2x = 6^2 - 5^0
=> 7x = 36 - 1 = 35
=> x = 35 : 5 = 5.
Vậy x = 5
2) 5x + x = 150 : 2 + 3
=> 6x = 75+3 = 78
=> x = 78 : 6 =13.
Vậy x = 13
3) 6x + x = 5^11 : 5^9 - 3^1
=> 7x = 5^2 -3 = 25 - 3 = 22
=> x = 22 : 7 = 22 / 7.
Vậy x = 22/7
4) 5x + 3x = 3^6 : 3^3 .4 + 12
=> 8x = 3^3 .4 + 12= 27.4 + 12 = 108 + 12 =120
=> x = 120 : 8 = 15.
Vậy x = 15
5) 4x + 2x = 68 - 2^19 : 2^16
=> 6x = 68 - 2 ^3 = 68 - 8 =60
=> x = 60 : 6 =10.
Vậy x = 10
6) 5x + x = 39 - 3^11 : 3^9
=> 6x = 39 - 3^2 = 39 - 9 = 30
=> x = 30 : 6 =5.
Vậy x =5
7) 7x - x = 5^21 : 5^19 + 3. 2^2 - 7^0
=> 6x = 5^2 + 3.4 - 1 = 25 + 12 - 1 = 36
=> x = 36 : 6 = 6.
Vậy x = 6
8) 7x - 2x = 6^17 : 6^15 + 44 : 11
=> 5x = 6^2 + 4 = 36 + 4 = 40
=> x = 40 : 5 = 8 .
Vậy x = 8
( 6x - 39 ) : 3 = 201
6x - 39 = 603
6x = 642
x = 107
23 + 3x = 56 : 53
23 + 3x = 125
2x = 102
x = 51
\(a)5x+x=39-3^{11}\div3^9\)9
\(5x+x1=39-3^2\)
\(5x+x1=39-9\)
\(5x+x1=30\)
\(x\left(1+5\right)=30\)
\(x6=30\)'
\(\Leftrightarrow x=30\div6\)
\(\Leftrightarrow x=5\)
\(b)7x-x=5^{21}\div5^{19}+3.2^2-7^0\)
\(7x-x=5^2+3.4-1\)
\(7x-x1=25+12-1\)
\(7x-x1=37-1\)
\(7x-x1=36\)
\(\Leftrightarrow x\left(7-1\right)=36\)
\(\Leftrightarrow x6=36\)
\(\Leftrightarrow x=36\div6\)
\(\Rightarrow x=6\)
\(c)5x+3x=3^6.4+12\)
\(5x+3x=729.4+12\)
\(5x+3x=2916+12\)
\(5x+3x=2928\)
\(\Leftrightarrow x\left(3+5\right)=2928\)
\(\Leftrightarrow x8=2928\)
\(\Leftrightarrow x=2928\div8\)
\(\Rightarrow x=366\)
\(d)7x-2x=6^{17}\div6^{15}+44\div11\)
\(7x-2x=6^2+44\div11\)
\(7x-2x=36+4\)
\(7x-2x=40\)
\(\Leftrightarrow x\left(7-2\right)=40\)
\(\Leftrightarrow x5=40\)
\(\Leftrightarrow x=40\div5\)
\(\Rightarrow x=8\)
a) \(5x+3x+6x=280\)
\(\Leftrightarrow14x=280\)
\(\Leftrightarrow x=20\)
b) \(15x-12x+6x=3^5:3^3\)
\(\Leftrightarrow9x=3^2=9\)
\(\Leftrightarrow x=1\)
c) \(12+6\left(3x-23\right)=6^5:6^3\)
\(\Leftrightarrow12+18x-138=6^2=36\)
\(\Leftrightarrow18x=162\)
\(\Leftrightarrow x=9\)
d) \(115-15\left(6x-23\right)=5^5:5^3\)
\(\Leftrightarrow115-90x+345=5^2=25\)
\(\Leftrightarrow90x=435\)
\(\Leftrightarrow x=\frac{29}{6}\)
a)5x+3x+6x=280
14x = 280
x = 280 : 14
x = 20.
b)15x-12x+6x=35÷33
9x = \(3^2\)
9x = 9
x = 9 : 9
x = 1
c)12+6(3x-23)=65÷63
12 + \(\left[18x-138\right]\)= \(6^2\)
12 + \(\left[18x-138\right]\)= 36
\(\left[18x-138\right]\) = 36 - 12
\(\left[18x-138\right]\) = 24
18x = 24 + 138
18x = 162
x = 162 : 18
x = 9.
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