Question

Tìm x

X-1/5 = 2x+1/3

X+3/2x-5 = 2/3

2/3 . 3^x+1 - 7 . 3^x = -405

2^x+3 . 5 + 2^x+2 . 3 + 2^x+1 . 24 = 200

Answer 1

x- 1/5=2x+1/3

x-2x=1/5+1/3

-x= 8/15

=> x= -8/15

Answer 2

bn ơi đề câu 2 bn viết x+3/2 rồi nhân hay x đó

Answer 3

b: \(\dfrac{x+3}{2x-5}=\dfrac{2}{3}\)

=>4x-10=3x+9

=>x=19

c: \(\Leftrightarrow3^x\cdot\left(\dfrac{2}{3}\cdot3-7\right)=-405\)

=>3^x=81

=>x=4

d: \(\Leftrightarrow2^x\cdot40+2^x\cdot12+2^x\cdot48=200\)

=>2^x=2

=>x=1