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4 + a- 7 = 6
8+b-9 = 7

9 + C - 6 = 5
d+ 9 - 12 = 5
6 + d-4-9​

Răspuns :

Lauraandreea2219

4+a-7=6

4+a=6+7

4+a=13

a=13-4

a=9

8+b-9=7

8+b=7+9

8+b=16

b=16-8

b=8

9+c-6=5

9+c=5+6

9+c=11

c=11-9

c=2

d+9-12=5

d+9=5+12

d+9=17

d=17-9

d=8

6+d-4-9=

=6+8-4-9

=14-4-9

=10-9

=1

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