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a fost răspuns

afla nr necunoscut 28+15:a+21:3=38,36-24:6-b+49:7=29,(16-2):7+49:7×c=16

Răspuns :

28+15:a+21:3=38
28+15:a+7=38
15:a+35=38
15:a=38-35=3
a=15:3
a=5

36-24:6-b+49:7=29
36-4-b+7=29
32-b+7=29
32-b=29-7=22
b=32-22
b=10

(16-2):7+49:7xc=16
14:7+7xc=16
2+7xc=16
7c=16-2=14
c=14:4
c=2
28+15:a+7=38
28+7+15:a=38
35+15:a=38
15:a=38-35
15:a=3
a=15:3
a=5

36-4-b+7=29
32-b+7=29
32-b=29-7
32-b=22
b=32-22
b=10

(16-2):7+7×c=16
14:7+7×c=16
2+7×c=16
7×c=16-2
7×c=14
c=14:7
c=2