Question

Tìm x:

(3 . x - 2 mũ 4) . 7 mũ 3 = 2 . 7 mũ 4

Answer 1

(3.x-2^4).7^3=2.7^4

3.x-2^4=2.7^4:7^3

3.x-16=2.7^1

3.x-16=2.7

3.x-16=14

3.x=14+16

3.x=30

x=30:3

x=10

Vậy x=10

Answer 2

(3.x-2⁴).7³=2.7⁴

(3.x-16).343=4802

3.x-16=4802-343

3.x-16=4459

3.x=4459-16

3.x=4443

x=4443:3

x=1481

Answer 3

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Answer 4

\(\left(3x-2^4\right)\times7^3=2\times7^4\)

\(\Rightarrow\left(3x-16\right)\times343=2\times2401\)

\(\Rightarrow\left(3x-16\right)\times343=4802\)

\(\Rightarrow3x-16=4802:343\)

\(\Rightarrow3x-16=14\)

\(\Rightarrow3x=14+16\)

\(\Rightarrow3x=30\)

\(\Rightarrow x=30:3\)

\(\Rightarrow x=10\)

Vậy x = 10

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