A 2X +17= 45 2X = 28 X=14 0,75 B 35 – 5(X - 1) = 10 X-1 = 2...

Câu 2 a 2x +17= 45

2x = 28

x=14

0,75

b 35 – 5(x - 1) = 10

x-1 = 25:5

x = 6

c 4.2

^x

  3 125

2

^x

=32

X= 5

x 19 x B (19)

d

 

B (19) 0;19; 38; 57; 76; 95;114;...

x B (19); 30 x 100 x 38; 57; 76; 95