tìm x biết (3x-1) mũ 3 = 1 phần 27 Question tìm x biết (3x-1) mũ 3 = 1 phần 27 in progress 0 Môn Toán RI SƠ 4 years 2020-10-31T22:30:32+00:00 2020-10-31T22:30:32+00:00 2 Answers 210 views 0
Answers ( )
`(3x-1)^3=1/27`
`=> 3x-1=1/3`
`=>3x=4/3`
`=>x=4/9`
(3x – 1)³ = $\frac{1}{27}$
(3x – 1)³ = ($\frac{1}{3}$)³
⇔ 3x – 1 = $\frac{1}{3}$
⇔ 3x = $\frac{1}{3}$ + 1
⇔ 3x = 1$\frac{1}{3}$
⇔ x = 1$\frac{1}{3}$ : 3
⇔ x = $\frac{4}{9}$
Chúc học tốt!!!