Question

tim x,biet:

5^x=125         3^2x=81         5^2x-3 -2.5²=5².3

Answer 1

5^x=125

Mà: 5³=125

=>x=3

3^2x=81

Mà: 3⁴=81

=>3^2x=3⁴

=>2x=4

=>x=4:2

=>x=2

5^2x-3-2.5²=5².3

=>5^2x-3-50=75

=>5^2x-3=75+50

=>5^2x-3=125

Mà: 5³=125

=> 5^2x-3=5³

=>2x-3=3

=>2x=3+3

=>2x=6

=>x=6:2

=>x=3

Answer 2

5^x=125

Mà: 5³=125

=>x=3

3^2x=81

Mà: 3⁴=81

=>3^2x=3⁴

=>2x=4

=>x=4:2

=>x=2

5^2x-3-2.5²=5².3

=>5^2x-3-50=75

=>5^2x-3=75+50

=>5^2x-3=125

Mà: 5³=125

=> 5^2x-3=5³

=>2x-3=3

=>2x=3+3

=>2x=6

=>x=6:2

=>x=3

Answer 3

5^x=125

Mà: 5³=125

=>x=3

3^2x=81

Mà: 3⁴=81

=>3^2x=3⁴

=>2x=4

=>x=4:2

=>x=2

5^2x-3-2.5²=5².3

=>5^2x-3-50=75

=>5^2x-3=75+50

=>5^2x-3=125

Mà: 5³=125

=> 5^2x-3=5³

=>2x-3=3

=>2x=3+3

=>2x=6

=>x=6:2

=>x=3

Answer 4

5^x=125

Mà: 5³=125

=>x=3

3^2x=81

Mà: 3⁴=81

=>3^2x=3⁴

=>2x=4

=>x=4:2

=>x=2

5^2x-3-2.5²=5².3

=>5^2x-3-50=75

=>5^2x-3=75+50

=>5^2x-3=125

Mà: 5³=125

=> 5^2x-3=5³

=>2x-3=3

=>2x=3+3

=>2x=6

=>x=6:2

=>x=3

Answer 5

5^x=125

Mà: 5³=125

=>x=3

3^2x=81

Mà: 3⁴=81

=>3^2x=3⁴

=>2x=4

=>x=4:2

=>x=2

5^2x-3-2.5²=5².3

=>5^2x-3-50=75

=>5^2x-3=75+50

=>5^2x-3=125

Mà: 5³=125

=> 5^2x-3=5³

=>2x-3=3

=>2x=3+3

=>2x=6

=>x=6:2

=>x=3

Answer 6

5^x = 125 

=> 5^x = 5³

=> x = 3

3^2x = 81

=> 3^2x = 3⁴

=> 3^2x = 3^2.2

=> 2x = 2.2

=> x = 2

5^2x-3 - 2.5² = 5² . 3

=> 5^2x-3 - 50 = 75

=> 5^2x-3 = 75 + 50

=> 5^2x-3 = 125

=> 5^2x-3 = 5³

=> 2x - 3 = 3

=> 2x = 3 + 3

=> 2x = 6

=> x = 6 : 2

=> x = 3

Answer 7

5^x = 125 

=> 5^x = 5³

=> x = 3

3^2x = 81

=> 3^2x = 3⁴

=> 3^2x = 3^2.2

=> 2x = 2.2

=> x = 2

5^2x-3 - 2.5² = 5² . 3

=> 5^2x-3 - 50 = 75

=> 5^2x-3 = 75 + 50

=> 5^2x-3 = 125

=> 5^2x-3 = 5³

=> 2x - 3 = 3

=> 2x = 3 + 3

=> 2x = 6

=> x = 6 : 2

=> x = 3

Answer 8

5^x = 125 

=> 5^x = 5³

=> x = 3

3^2x = 81

=> 3^2x = 3⁴

=> 3^2x = 3^2.2

=> 2x = 2.2

=> x = 2

5^2x-3 - 2.5² = 5² . 3

=> 5^2x-3 - 50 = 75

=> 5^2x-3 = 75 + 50

=> 5^2x-3 = 125

=> 5^2x-3 = 5³

=> 2x - 3 = 3

=> 2x = 3 + 3

=> 2x = 6

=> x = 6 : 2

=> x = 3

Answer 9

5^x = 125 

=> 5^x = 5³

=> x = 3

3^2x = 81

=> 3^2x = 3⁴

=> 3^2x = 3^2.2

=> 2x = 2.2

=> x = 2

5^2x-3 - 2.5² = 5² . 3

=> 5^2x-3 - 50 = 75

=> 5^2x-3 = 75 + 50

=> 5^2x-3 = 125

=> 5^2x-3 = 5³

=> 2x - 3 = 3

=> 2x = 3 + 3

=> 2x = 6

=> x = 6 : 2

=> x = 3