Question

A) ( 10 + 2 ) : ( 5x3 )= b) (10-2)-(-5+3)= C) 10+5 + 15-3= d)10-5 + 15 + 3= e) (100+5) : (10-5)=

Answer 1

a) 
= ( 10 + 2 ) : ( 5 x 3 )
= 12 : 15

12 (:3)  =  4  = 0,8
15 (:3)      5
----------------------------
b) 
= (10 - 2) - ( - 5 + 3)
= 8 - ( - 2)
= 8 + 2
= 10
---------------------------------------------
c)
= 10+5 + 15-3
= 15 + 12
= 27
-------------------------------------
d)
= 10 - 5 + 15 + 3
= 5 + 18
= 23
--------------------------------
e)
= (100+5) : (10-5)
= 105 : 5
= 21