Question

x⁵ = 32

3^x .3 = 243 

2^x .7 = 56 

Ai làm nhanh mình tick nhé

Answer 1

\(x^5=32\)

\(\Rightarrow x=2\), vì \(2^5\)= 2.2.2.2.2 = 32

Vậy x = 2

\(3^x.3=243\)

\(3^x=243:3\)

\(3^x=81\)

\(\Rightarrow x=4\)

Vậy x = 4

\(2^x.7=56\)

\(2^x=56:7\)

\(2^x=8\)

\(\Rightarrow x=3\)

Vậy x = 3

Answer 2

a) \(x^5=32\)

\(\Rightarrow x^5=2^5\)

\(\Rightarrow x=2\)

b) \(3^x.3=243\)

\(\Rightarrow3^x=81\)

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

c) \(2^x.7=56\)

\(\Rightarrow2^x=8\)

\(\Rightarrow2^x=2^3\Rightarrow x=3\)

Answer 3

 x^5-(32)=0 

(x⁴ + 2x³ + 4x² + 8x + 16) • (x - 2) = 0

x⁴+2x³+4x²+8x+16 = 0

x-2=0

x=2

 3*x*(3/10)-(243)=0 

(3x • \(\frac{3}{10}\)) - 243 = 0 9x - (243 • 10) 9x - 2430 ——————————————— = ————————— 10 10

9x - 2430  =   9 • (x - 270)

    

 9 • (x - 270) ————————————— = 0 10

9•(x-270)

————————— • 10 = 0 • 10 10

x-270 = 0 

x=270

      2*x*(7/10)-(56)=0 

(2x • \(\frac{7}{10}\)) - 56 = 0 7x - (56 • 5) 7x - 280————————————— = ———————— 5 5

 7x - 280  =   7 • (x - 40) 

7 • (x - 40) ———————————— = 0 5 7•(x-40) ———————— • 5 = 0 • 5 5

7  •  (x-40)  = 0

  x-40 = 0 

x=40

học tốt

ko chắc nhé

Answer 4

\(x^5=32=>\) \(x^5=2^5vì\) \(2.2.2.2.2=32\)VẬY : \(x^5=2^5\)

\(3^x.3=243=>3^x=3^4vì\)\(3.3.3.3=81.3=243\)VẬY : \(3^x=3^4\)

\(2^x.7=56=>2^x=2^3vì\)\(2.2.2=8.7=56\)VẬY : \(2^x=2^3\)

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