Question

Afla numerele necunoscute:
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Answer 1

a + 7 = 15

a = 15 - 7

a = 8

b + 9 = 11

b = 11 - 9

b = 2

6 + c = 13

c = 13 - 6

c = 7

Answer 2

Răspuns:

a+7=15

a=15-7

a=8

verificare:8+7=15

b+9=11

b=11-9

b=2

verificare:2+9=11

6+c=13

c=13-6

c=7

verificare:6+7=13