Question

a)27.3 mũ x = 3 mũ 10

b)60+3x=9 mũ 10:9 mũ 8

c)23-3(4+x)=3

Answer 1

a) 27 . 3^x = 3¹⁰

27 . 3^x = 59049

3^x = 59049 : 27

3^x = 2187

3^x = 3⁷

x = 7

b) 60 + 3x = 9¹⁰ : 9⁸

60 + 3x = 9²

60 + 3x = 81

3x = 81 - 60

3x = 21

  x = 21 : 3

  x = 7

c) 23 - 3(4+x ) = 3

3( 4 + x ) = 23 - 3

3( 4 + x ) = 20

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Answer 2

a) \(27.3^x=3^{10}\)

\(3^3.3^x=3^{10}\)

\(3^{3+x}=3^{10}\)

\(\Rightarrow3+x=10\)

\(\Rightarrow x=7\)

vậy \(x=7\)

b) \(60+3x=9^{10}:9^8\)

\(60+3x=9^{10-8}\)

\(60+3x=9^2\)

\(60+3x=81\)

\(3x=81-60\)

\(3x=21\)

\(x=7\)

vậy \(x=7\)

c) \(23-3\left(4+x\right)=3\)

\(23-12-3x=3\)

\(11-3x=3\)

\(3x=11-3\)

\(3x=8\)

\(x=\frac{8}{3}\)

vậy \(x=\frac{8}{3}\)

Answer 3

a) 27 . 3^x = 3¹⁰

27 . 3^x = 59049

3^x = 59049 : 27

3^x = 2187

3^x = 3⁷

x = 7

b) 60 + 3x = 9¹⁰ : 9⁸

60 + 3x = 9²

60 + 3x = 81

3x = 81 - 60

3x = 21

  x = 21 : 3

  x = 7

c) 23 - 3(4+x ) = 3

3( 4 + x ) = 23 - 3

3( 4 + x ) = 20

Đề bài sai nha bạn

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