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