1b) có thiếu ko cau?

`1a)5^3` và `3^5`

`5^3=125`

`3^5=243`

Vì `243>125` nên `3^5>5^3`

__

`c)3^24` và `27^7`

`27^7=(3^3)^7=3^21`

Vì `3^24>3^31` nên `3^24>27^7`

`2a)x^3=216`

`=>x^3=6^3`

`=>x=6`

__

`b)3^x+15=18`

`=>3^x=18-15`

`=>3^x=3`

`=>x=1`

3^x+1 + 3^x+2 - 2 x 3^x = 270

3^x ( 3 + 3² - 2) = 270

3^x . 10 = 270

3^x = 270 : 10

3^x = 27

3^x = 3³

x = 3

\(3^{x+1}+3^{x+2}-2.3^x=270\)

\(\Leftrightarrow3.3^x+3^2.3^x-2.3^x=270\)

\(\Leftrightarrow\left(3+3^2-2\right).3^x=270\)

\(\Leftrightarrow10.3^x=270\)

\(\Leftrightarrow3^x=27\)

\(\Leftrightarrow3^x=3^3\)

\(\Leftrightarrow x=3\)

a.\(2^x-2^4.2^7.32=0\)
\(2^x-2^{16}=0\)
\(=>x=16\)
b.\(3^x+3^{x+2}=270\)
\(3^x+3^x.3^2=270\)
\(3^x.10=270\)
\(3^x=27\)
\(=>x=3\)
 

bạn ơi giải chi tiết đi đừng gộp

Dễ mà em , hồi lớp 5 chị cũng làm đc toán lớp 6. 

a) x - 140 : 35 = 270

x - 4 = 270

x = 270 + 4

x = 274

b) ( x-140) : 35 = 270

x-140 = 270 x 35

x-140 = 9 450

x = 9 450  + 140

x = 9 590

các phần cn lại lm tương tự nha bn!
 

`@` `\text {Ans}`

`\downarrow`

`x - 32 \div 16 = 18`

`=> x - 2 = 18`

`=> x = 18 + 2`

`=> x = 20`

Vậy, `x = 20.`

`15 + 2x = 17`

`=> 2x = 17 - 15`

`=> 2x = 2`

`=> x = 2 \div 2`

`=> x = 1`

Vậy, `x = 1`

`324 - 13x = 57*5`

`=> 324 - 13x = 285`

`=> 13x = 324 - 285`

`=> 13x = 39`

`=> x = 39 \div 13`

`=> x = 3`

Vậy, `x = 3.`

`@` `\text {Kaizuu lv uuu}`

`#3107.101107`

a)

\(5\left(x-1\right)^3=40\\\Rightarrow\left(x-1\right)^3=40\div5\\ \Rightarrow\left(x-1\right)^3=8\\ \Rightarrow\left(x-1\right)^3=2^3\\ \Rightarrow x-1=2\\ \Rightarrow x=2+1\\ \Rightarrow x=3\)

Vậy, `x = 3`

b)

\(3^{2x+1}+9^x=324?\\ \Rightarrow3^{2x}\cdot3+3^{2x}=324\\ \Rightarrow3^{2x}\cdot\left(3+1\right)=324\\ \Rightarrow3^{2x}\cdot4=324\\ \Rightarrow3^{2x}=81\\ \Rightarrow3^{2x}=3^4\\ \Rightarrow2x=4\\ \Rightarrow x=2\)

Vậy, `x = 2`

c)

\(5^x-13=3\cdot2^2\\ \Rightarrow5^x-13=12\\ \Rightarrow5^x=12+13\\ \Rightarrow5^x=25\\ \Rightarrow5^x=5^2\\ \Rightarrow x=2\)

Vậy, `x = 2`

d)

\(8^x+2^{3x+1}=192\\ \Rightarrow2^{3x}+2^{3x}\cdot2=192\\ \Rightarrow2^{3x}\left(1+2\right)=192\\ \Rightarrow2^{3x}\cdot3=192\\ \Rightarrow2^{3x}=64\\ \Rightarrow2^{3x}=2^6\\ \Rightarrow3x=6\\ \Rightarrow x=2\)

Vậy, `x = 2.`

+) \(24+\left(x-6\right)=135\)

\(\Rightarrow x-6=135-24=111\)

\(\Rightarrow x=111+6=117\)

+) \(2019-2\cdot\left(3x-2\right)=19\)

\(\Rightarrow2\cdot\left(3x-2\right)=2019-19=2000\)

\(\Rightarrow3x-2=2000:2=1000\)

\(\Rightarrow3x=1000+2=1002\)

\(\Rightarrow x=1002:3\)

\(\Rightarrow x=334\)

+) \(3^x+3^{x+1}=324\)

\(\Rightarrow3^x+3^x\cdot3=324\)

\(\Rightarrow3^x\cdot\left(1+3\right)=324\)

\(\Rightarrow3^x\cdot4=324\)                      \(\Rightarrow3^x=324:4=81\)

\(\Rightarrow3^x=3^4\)                           \(\Rightarrow x=4\)

a) 4 . x + 15 = - 5

⇒ 4 . x = - 5 – 15

⇒ 4 . x = - 20

⇒ x = - 20 : 4

⇒ x = - 5.

Vậy x = - 5.

b) (- 270) : x – 20 = 70.

⇒ (- 270) : x = 70 + 20 

⇒ (- 270) : x = 90 

⇒ x = (- 270) : 90

⇒ x = - 3

Vậy x = - 3

270+6[x-15]=450 

        6[x-15]=450-270

        6[x-15]=180

         x-15=180:6

         x-15=30

         x=30+15

         x=45

\(270+6.\left(x-15\right)=450\)

\(\Leftrightarrow6.\left(x-15\right)=180\)

\(\Leftrightarrow x-15=30\)

\(\Leftrightarrow x=45\)

Vậy \(x=45\)