Question

me pueden ayudar por favor >:,,,v el que me ayude le doy corona UwU


1. 15 (7) 4

20 (13) 11

10 ( ) 14


2. 3 (13) 5

5 (17) 6

7 ( ) 4


3. 7 (8) 3

9 (14) 2

8 ( ) 5


4. 24 (5) 36

45 (8) 36

17 ( ) 4

Answer 1

son suma y resta de fracciones simples y reglas de signos:

1/4×[1/7-(-5/4)]

= (1/4)(1/7 + 5/4)

= (1/4)(4/28 + 35/28)

= (1/4)(39/28)

= 39/(4*28)

= 39/112

(2/3-1/4)

_______=

5mas1/2)

(2/3-1/4)/(5 + 1/2)

= (8/12 - 3/12)/(10/2 + 1/2)

= (5/12)/(11/2)

= (5/12)/(2/11)

= (5*2)/(12*11)

= 10/132