Question

cosmin a colectionat timbre mari si mici pentru care a platit 142,80 lei.Cate timbre mari si cate mici a cumparat daca un timbru mare costa 7,60 lei iar unul mic costa 2,40lei? VA ROG FRUMOS E URGENT!

Answer 1

X - timbre mici Y - timbre mari 7,60y+2,40×=142,80 X=(142,80-7,60y)/2,40 7,60y+(143,80-7,60y)/2,40=142,80 (18,24y+143,80-7,60y)/2,40=142,80 10,84y+143,80=342,72 10,84y=198,92 Y=18,35 X=1,39 Sa verifici calculele