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a) \(3^{x+1}=729\)\(\Leftrightarrow3.3^x=729\Rightarrow3^x=243\Rightarrow3^x=3^5\Rightarrow x=5\)
b) \(2^x+2^{x+1}+2^{x+3}=704\Rightarrow2^x+2^x.2+2^x.2^3=704\Rightarrow2^x\left(1+2+8\right)=704\)
\(\Rightarrow2^x.11=704\Rightarrow2^x=64\Rightarrow2^x=2^5\Rightarrow x=5\)
Trả lời
a)2x-15=17
2x =17-15
2x =2
x =2:2
x =1
b)3 1/8-1/2x=0,5
25/8-1/2x=1/2
1/2x=25/8-1/2
1/2x=21/8
x=21/8.2/1
x=21/4
c)8 1/4x+2 1/3=20
33/4x+7/3 =20
33/4x =20-7/3
33/4x =53/3
x =53/3.4/33
x =...
a) 2x - 15 = 17
2x = 17 + 15
2x = 32
x = 32 : 2
x = 16
Vậy x = 16
b) \(3\frac{1}{3}-\frac{1}{2}x=0,5\)
\(\frac{10}{3}-\frac{1}{2}x=\frac{1}{2}\)
\(\frac{1}{2}x=\frac{10}{3}-\frac{1}{2}\)
\(\frac{1}{2}x=\frac{17}{6}\)
\(x=\frac{17}{6}:\frac{1}{2}\)
\(x=\frac{17}{3}\)
Vậy x = 17/3
c) \(8\frac{1}{4}x+2\frac{1}{3}=20\)
\(\frac{33}{4}x+\frac{7}{3}=20\)
\(\frac{33}{4}x=20-\frac{7}{3}\)
\(\frac{33}{4}x=\frac{53}{3}\)
\(x=\frac{53}{3}:\frac{33}{4}\)
\(x=\frac{212}{99}\)
Vậy x = 212/99
=))
a, 1/2x +3/5(x-2)=3
1/2x +3/5.x -3/5.2=3
(1/2+3/5).x-6/5=3
11/10.x=21/5
x=42/11
b,| 1/2x-3/2|= 1/2
=> 1/2x-3/2=1/2
hoac 1/2x-3/2=-1/2
=> 1/2x=2
hoac 1/2x=1
=> x=4 hoac x=2