Răspuns :
Ana = 5 probleme si 3 exercitii = 75 puncte
Dan = 4 probleme si 5 exercitii = 75 puncte
75-10=65 puncte
10-5=5 puncte exercitiile
5×3=15
65-15 = 50
50:5= 10 probleme.
Raspuns final : 5 puncte exercitiile
10 puncte problemele
Succes !Coronita?
1/2 notăm cu a = problemele
b = exercitiile.
2/3
75 = 5a + 3b + 10 <=>
75 = 4a + 5b + 10 <=>
a = -(3b)/5 + 13
75 = 4 * ( - ( 3b )/5 + 13) + 5b + 10
75 = - ( 12b )/5 + 52 + 5b + 10
75 = ( 13b )/5 + 62
375 = 13b + 310
-13b + 375 = 310
-13b = -65
b = 5
a = 10
b = exercitiile.
2/3
75 = 5a + 3b + 10 <=>
75 = 4a + 5b + 10 <=>
a = -(3b)/5 + 13
75 = 4 * ( - ( 3b )/5 + 13) + 5b + 10
75 = - ( 12b )/5 + 52 + 5b + 10
75 = ( 13b )/5 + 62
375 = 13b + 310
-13b + 375 = 310
-13b = -65
b = 5
a = 10