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ma puteti ajuta ? : (30x10)-(4xf+50x2)=100

Răspuns :

 (30x10)-(4xf+50x2)=100
300 - (4f +100)=100
4f+100 = 300-100
4f+100=200
4f = 200-100
4f=100
f=100:4
f= 25
300-(4f+100)=100
4f+100=300-100
4f+100=200
4f=200-100
4f=100
f=25