Question

Tìm x:

2. 3^x = 10 . 3¹² + 8 . 3¹²

Giúp mình nha mọi người, có cả cách làm nhé!

Answer 1

2.3^x = 10.3¹² + 8.3¹²

2.3^x = (10+8).3¹²

2.3^x = 18.3¹²

2.3^x = 2.3².3¹²

2.3^x = 2.3¹⁴

=> x = 14

Answer 2

2.3^x=10.3^12+8.3^12

2.3^x=3^12.(10+8)

2.3^x=3^12.18

2.3^x=3^12.(3^2+3^2)

2.3^x=3^12.3^2+3^12.3^2

2.3^x=3^15+3^15

2.3^x=3^15.2

=> 3^x=3^15

=> x=15

Answer 3

2.3^x=10.3^12+8.3^12

2.3^x=3^12.(10+8)

2.3^x=3^12.18

2.3^x=3^12.2.3^2

2.3^x=3^14.2

       suy ra 3=14

Answer 4

2.3^x=10.3¹²+8.3¹²

2.3^x=(10+8).3¹²

2.3^x=18.3¹²

3^x=3¹².18:2=3¹².9=3¹².3²=3¹⁴

=>x=14

 

Answer 5

Mik ko hiêu câu tra loi lăm:))))