Question

Answer 1

Bài 3

a) 140 : (x - 8) = 7

x - 8 = 140 ÷ 7

x - 8 = 20

x = 20 + 8

x = 28

Vậy x = 28

b) 6x + x = 5¹¹ ÷ 5⁹ + 3¹

7x = 5² + 3

7x = 25 + 3

7x = 28

x = 28 ÷ 7

x = 4

Vậy x = 4

Bài 2

a) 81 = 9 . 9

b) 81 = 1 . 81 = 3 . 27

Answer 2

\(Bài3\\ a,x-8=20\\ x=28\\ b,6x+5=5^2+3\\ 6x+x=28\\ 7x=28\\ x=4\\ Bài4\\ a,=9.9\\ b,=3.27\)

Answer 3

a. 140 : (x - 8) = 7

x - 8 = 140 ÷ 7

x - 8 = 20

x = 20 + 8

x = 28

vậy x = 28

b. 6x + x = 5¹¹ ÷ 5⁹ + 3¹

7x = 5² + 3

7x = 25 + 3

7x = 28

x = 28 ÷ 7

x = 4

vậy x = 4

lm bài 3 thoi nha :V