Ex.4:
a - b = 3 872
a : b = 4 rest 17
a = 4b + 17
4b + 17 - b = 3 872 <=> 3b = 3 872 - 17 <=> 3b = 3 855 <=> b = 3 855 : 3
b = 1 285
a = 4×1 285 + 17 <=> a = 5 140 + 17 <=> a = 5 157
Ex.5.:
30x5=150 (puncte ar fi luat elevul) daca a obtinut punctajul maxim
150-118=32(puncte a pierdut elevul in total)
5+3=8 (puncte pierde el pt fiecare raspuns eronat)
32:8=4(raspunsuri gresite)
30-4=26(raspunsuri corecte)
Ex.6.:
3 caiete...............4 carti.............29 lei inmultim cu 3
9 caiete..............12 carti..............x lei
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9 caiete............12 carti.............3x29=87 lei
