Question

cứu mình vớiii 🥲

Answer 1

Bài 1

a) 2/5 + 3/5 : (-3/2)

= 2/5 - 2/5

= 0

b) 2/3 + (-1/2)²

= 2/3 + 1/4

= 11/12

c) (1/2)² + (-1/3) : 1/6

= 1/4 - 2

= -7/4

d) 2 1/3 + (-1/3)² - 1,5

= 7/3 + 1/9 - 3/2

= 17/18

e) 3 . 0,5 + (-2)² : 1/2

= 3/2 + 4 : 1/2

= 3/2 + 8

= 19/2

f) 3 - (-6/7)⁰ + (1/2)² : 2

= 3 - 1 + 1/4 : 2

= 2 + 1/8

= 17/8

Answer 2

Bài 2

a) 1/4 + 3/4 : x = 11/36

3/4 : x = 11/36 - 1/4

3/4 : x = 1/18

x = 3/4 . 1/18

x = 1/24

b) -2/3 - (2x - 1/2) = 1,5

2x - 1/2 = -2/3 - 3/2

2x - 1/2 = -13/6

2x = -13/6 + 1/2

2x = -5/3

x = -5/3 : 2

x = -5/6

c) 3(x - 1/5) + 2/5 = 1

3(x - 1/5) = 1- 2/5

3(x - 1/5) = 3/5

x - 1/5 = 3/5 : 3

x - 1/5 = 9/5

x = 9/5 + 1/5

x = 2

d) (x - 0,5) : 3/10 + 1/3 = 1 1/3

(x - 1/2) : 3/10 = 4/3 - 1/3

(x - 1/2) : 3/10 = 1

x - 1/2 = 1 . 3/10

x - 1/2 = 3/10

x = 3/10 + 1/2

x = 4/5

e) (5x - 1)(2x - 1/3) = 0

5x - 1 = 0 hoặc 2x - 1/3 = 0

*) 5x - 1 = 0

5x = 1

x = 1/5

*) 2x - 1/3 = 0

2x = 1/3

x = 1/3 : 2

x = 1/6

Vậy x = 1/6; x = 1/5

f) (x + 1/2)² = 1/4

(x + 1/2)² = (1/2)² hoặc (x + 1/2)² = (-1/2)²

x + 1/2 = 1/2 hoặc x + 1/2 = -1/2

*) x + 1/2 = 1/2

x = 0

*) x + 1/2 = -1/2

x = -1/2 - 1/2

x = -1

Vậy x = -1; x = 0

Answer 3

Bài 3

Chiều dài là: 25,8 . 3/2 = 38,7 (m)

Diện tích khu vườn:

38,7 . 25,8 = 998,46 (m²)