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A) 15×a+5=50
B) (38-a)÷2=17
C) (56+a)÷3=20
D) (90÷c)÷3=10


Răspuns :

A) x=3
B) a=4
C) a=4
D) c=3
A.15•a+5=50 15•a=50-5 15•a=45 a=45:15 a=3 B.(38-a):2=17 38-a=17•2 38-a=34 a=34+38= 72 C.(56+a):3=20 56+a=20•3 56+a=60 a=60-56 a=4 D.(90:c):3=10 90:c=10•3 90:c=30 c=30•90 c=2700 Cel mai bun răspuns te rog! Cpl