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2/5.3x-1/2-1/4=1/5
=>2/5.3x-1/4=1/5
=>2/5.3x=1/5+1/4
=>2/5.3x=9/20
=>3.x=9/20:2/5
=>3.x=9/8
=>x=9/8:3
=>x=3/8
vay x=3/8
2/5.3x-1/2-1/4 = 1/5
=> 2/5.3x = 1/5+1/4+1/2
2/5.3x = 19/20
3x = (19/20):(2/5)
3x = 19/8
x = (19/8):3
x = 19/24
Trả lời:
\(3x+1+5\times3x+2=144\)
\(\Leftrightarrow3x+1+15x+2=144\)
\(\Leftrightarrow18x=141\)
\(\Leftrightarrow x=\frac{47}{8}\)
Vậy \(x=\frac{47}{8}\)
\(2.3^x+5.3^x.3=153\Leftrightarrow2.3^x+15.3^x=153\)
\(\Leftrightarrow17.3^x=153\Leftrightarrow3^x=9\Leftrightarrow x=2\)
\(\Leftrightarrow2.3^x+5.3.3^x=153\)
\(\Leftrightarrow17.3^x=3^2.17\)
\(\Leftrightarrow3^x=3^2\Rightarrow x=2\)
( 3x - 6 )^2 = 36
=> ( 3x - 6 )^2 = 6^2
=> 3x - 6 = 6
=> 3x = 6 + 6
=> 3x = 12
=> x = 12 : 3
=> x = 4
( 3x - 6 )2 =36
3x - 6 = 36
3x = 36 +6
3x = 42
x = 42 : 3
x = 14
Vậy x = 14
\(\dfrac{3}{8}x-\dfrac{1}{4}-\dfrac{2}{3}x+\dfrac{1}{9}=\dfrac{7}{36}\)
=> \(\dfrac{3}{8}x-\dfrac{2}{3}x-\left(\dfrac{1}{4}+\dfrac{1}{9}\right)=\dfrac{7}{36}\)
=> \(\dfrac{-7}{24}x-\dfrac{5}{36}=\dfrac{7}{36}\)
=> \(\dfrac{-7}{24}x=\dfrac{1}{3}\)
=> \(x=\dfrac{-8}{7}\)
\(\left(x-36\right):18=12\)
\(x-36=12.18\)
\(x-36=216\)
\(x=252\)
vậy \(x=252\)
\(5x-3=3x-11\)
\(5x-3x=-11+3\)
\(2x=-8\)
\(x=-4\)
vậy \(x=-4\)
\(3x+5x=16\)
\(8x=16\)
\(x=2\)
vậy \(x=2\)
\(2\left(x+1\right)=10\)
\(x+1=5\)
\(x=4\)
vậy \(x=4\)
k nha Pham Tuyet Nhung
1.=> x-36 = 216 = > x = 216 +36 =252
2. =>2x = -8 = > x= -4
3.8 x = 16 = > x = 2
4 . => x= 10 -1 = 9
ok có j ko hiểu hỏi riêng nha
a.219 - 7(x+1) = 100
7(x+1) = 219 - 100
7(x+1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
b. (3x - 6 ) . 3 = 36
3x - 6 = 36 : 3
3x - 6 = 12
3x = 12 + 6
3x = 18
x = 18 : 3
x = 6
c.716 - ( x-143) = 659
x-143 = 716 - 659
x-143 = 57
x = 57 + 143
x = 200
b. 30 - [4(x-2)+15] = 3
4(x-2) + 15 = 30 - 3
4(x-2)+15 = 27
4(x-2) = 27 - 15
4(x-2) = 12
x-2 = 12 : 4
x-2 = 3
x = 2 + 3 = 5
e.[(8x - 12) : 4] .33 = 36
[(8x - 12) : 4] . 27 = 729
(8x - 12) : 4 = 729 : 27 = 27
8x - 12 = 27 . 4 = 108
8x = 108 + 12 = 120
x = 120 : 8 = 15
a) \(\Leftrightarrow7\left(x+1\right)=119\\ \Leftrightarrow x+1=17\\ \Leftrightarrow x=16\)
b) \(\Leftrightarrow9\left(x-2\right)=36\\ \Leftrightarrow x-2=4\\ \Leftrightarrow x=6\)
c) \(\Leftrightarrow x-143=57\\ \Leftrightarrow x=200\)
d) \(\Leftrightarrow4\left(x-2\right)+15=27\\ \Leftrightarrow4\left(x-2\right)=12\\ \Leftrightarrow x-2=3\\ \Leftrightarrow x=5\)
e) \(\Leftrightarrow\left(2x-3\right).4:4=3^3\\ \Leftrightarrow2x-3=27\\ \Leftrightarrow2x=24\\ \Leftrightarrow x=12\)
x = 2
3 mũ x . 9 - 5. 3 mũ x = 36
3 mũ x . ( 9-5 ) = 36
3 mũ x = 36 : 4 = 9