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Aflati numerele neconuscute: 1.(a:7+4)*8-14=50 2.(39-a:7)40-48=9 3.62+(36:6-9*6):a-6*8=20 4.(131-67):-(5*6+10):8+87=100

Răspuns :

1.(a:7+4)*8-14=50
(a:7+4)*8=50+14
(a:7+4)*8=64
a:7+4=64:8
a:7+4=8

a:7=8-4

a:7=4

a=4*7

a=28


2.(39-a:7)*40-48=9
(39-a:7)*40=9+48
(39-a:7)*40=57
(39-a:7)=57:40
39-a:7=1,425

a:7=39-1,425
a:7=37,575
a=263,025

3.62+(36:6-9*6):a-6*8=20
62+(36:6-9*6):a-6*8=20
62+(6-54):a-48=20

62+(6-54):a=20+48

62+(6-54):a=68

(6-54):a=68-62

(6-54):a=6

-48:a=6

-a=48:6

-a=8

a=-8

4.(131-67):c-(5*6+10):8+87=100
64:c-(30+10):8+87=100
64:c-40:8+87=100

64:c-5+87=100

64:c=100+5-87

64:c=18

c=64:18

c=3,(5)