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Afla termenul necunoscut.
ax10+72=5272
(b+13)x100-4200=5800
3290-cx100+460=750


Răspuns :

a)
a*10+72=5272
10a=5272-72
10a=5200
a=5200/10
a=520

b)
(b+13)*100-4200=5800
(b+13)*100=5800+4200
(b+13)*100=10000
b+13=10000/100
b+13=100
b=100-13
b=87

c)
3290-c*100+460=750
3290+460-750=100c
300=100c
c=300/100
c=3

sper ca te-am ajutat^^