Question

calculeaza numarul necunoscult

a)6×6:a=4


b) 20:2×a=90

c)4×2×a=80


dau coroana

Answer 1

6×6 :a=4 36:a=4 a=36:4 = 9
20:2 × a=90 10 ×a=90 a=90:10 = 9
4×2 ×a=80 8×a=80 a=80:8 = 10

Answer 2

a)
6 × 6 : a = 4
36 : a = 4 
a = 36 : 4 
a = 9 

Verific:   36 : 9 = 4


b)
20 : 2 × a = 90
10 × a = 90 
a = 90 : 10 
a = 9 

Verific:  20 : 2 x 9 = 10 x 9 = 90

c)
4 × 2 × a = 80
8 × a = 80 
a = 80 : 8 
a = 10 

Verific:   4 × 2 × 10 = 8 × 10 = 80