Chu vi mảnh vườn hình chữ nhật là

(5,5 + 3,75 ) x 2 = 18,5 (m)

Số khóm hoa cần trồng là :

18,5 : 1/4 = 74 ( khóm hoa)

Đáp số: 74 khóm hoa

a) 4/5 : x = 0,75 - 1/5

4/5:x = 11/20

X = 4/5 : 11/20

X= 16/11

b) x+x = 1- 1/2

x+x = 1/2

X2 = 1/2

X= 1/2 ÷ 2

X = 1/4

a) 4/5 : x = 0,75 - 1/5

4/5:x = 11/20

X = 4/5 : 11/20

X= 16/11

b) x+x = 1- 1/2

x+x = 1/2

X2 = 1/2

X= 1/2 ÷ 2

X = 1/4

a)= 2/3 . ( 5/4 - 3/4)

=2/3. 1/2

= 1/3

b) = 2. 9/4 - 7/2

= 9/2-7/2

= 1

c) = -3/4 . 68/13 - 3/4. 36/13

= -3/4. ( 68/13 - 36/13)

= -3/4 . 32/13

= -24/13

a)= 2/3 . ( 5/4 - 3/4)

=2/3. 1/2

= 1/3

b) = 2. 9/4 - 7/2

= 9/2-7/2

= 1

c) = -3/4 . 68/13 - 3/4. 36/13

= -3/4. ( 68/13 - 36/13)

= -3/4 . 32/13

= -24/13

a)= 2/3 . ( 5/4 - 3/4)

=2/3. 1/2

= 1/3

b) = 2. 9/4 - 7/2

= 9/2-7/2

= 1

c) = -3/4 . 68/13 - 3/4. 36/13

= -3/4. ( 68/13 - 36/13)

= -3/4 . 32/13

= -24/13