Question

Dau coroana!!! VA ROGG URGENTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT

Calculati:


a= 5x8+6x9+7x10+...+20x23

b= 5x9+6x10+7x11+...+20x24
Care dintre urmatoarele afirmatii este adevarata?
A) b=15+a
B) b=20+a
C) b=180+a
D) b=200+a
E) b=220+a

DAU COROANAAAAAAAAAAAAAAAAAAA VA ROGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG


x = ori, nu inseamna altceva

Answer 1

Răspuns:

Explicație pas cu pas:

b - a = 5 x 9 + 6 x 10 + ... + 20 x 24 - 5 x 8 - 6 x 9 - ... - 20 x 23 =

       = 5 x (9 - 8) + 6 x (10 - 9) + ... 20 x (24 - 23) =

       = 5 x 1 + 6 x 1 + ... + 20 x 1 =

       = 5 + 6 + 7 + .... + 20 =

       = 200

b - a = 200

b = 200 + a

răspuns corect: D