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afla numarul necunoscut;a+7865<8000
1530>a-643<1560
4482-a<2987


Răspuns :

a+7865<8000
a
<8000-7865
a<135
a=1,2,3,4.....134

1530>a-643<1560
1530
>a<2203
a=1531, 1532, 1533, 1534.....2202

4482-a<2987
a<4482-2987
a<1495
a=1,2,3,....1494