Question

Tìm x biết ( 3 . x - 2^4 ) . 7^3 = 2 . 7^4

Answer 1

#)Giải :

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

\(\Rightarrow3x-16=2.7^4\div7^3\)

\(\Rightarrow3x-16=2.7\)

\(\Rightarrow3x-16=14\)

\(\Rightarrow3x=30\)

\(\Rightarrow x=10\)

Answer 2

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

\(\left(3.x-16\right).343=2.2401\)

\(\left(3.x-16\right).343=4802\)

\(3.x-16=4802:343\)

\(3.x-16=14\)

\(3.x=14+16\)

\(3.x=30\)

\(x=30:3\)

\(x=10\)