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1,25x - drugi podrecznik
x+1,25x=45
2,25x=45 /2,25
x=20 cena pierwszego podrecznika
1,25x=25 cana drugiego podrecznika
x=20zl
za pierwszy zaplacono 20 zl
a za drugi 1,25*20=25zl
x+25/100x- cena 2 podręcznika
x+x+25/100x=45
2x+25/100x=45
200/100x+25/100x+45
225/100x=45 ×100
225x=450
x=2 - cena pierwszego
2+25/100 × 2=2+0,5=2,5 - cena drugiego