Question

Tìm x, biết rằng: a) 2x = 16 b) 3x+1 = 9xc) 23x+2 = 4x+5d) 32x-1 = 243

Answer 1

a) 2x = 16 <=>x=8

b) 3x+1 = 9x <=>9x-3x=1

<=>6x=1 <=>x=1/6

c) 23x+2 = 4x+5 <=>23x-4x=5-2

<=>19x=3 <=>x=3/19

d) 32x-1 = 243 <=>32x=244

<=>x=61/8

Answer 2

a/ 2x=16

x=8

b/ 3x+1=9x

3x-9x=-1

-6x=-1

x=1/6

c/ 23x+2=4x

23x-4x=-2

19x=-2

x=-2/19

d/ 32x-1=243

32x=244

x=61/8