Question

9. Calculează:
a) (4 + 8 + 12): (2 + 4 + 6);
c) (6 + 12 + 18)': (3 + 6+9);
b) (4 + 8 + 12 + 16 + ... + 100) : (2 + 4 + 6 + ... + 50):
d) (6 + 12 + 18+ ... + 300) : (3 + 6 + 9 + ... + 150).​

Answer 1

a)24:12=2

c)36:18=2

b)(4+8+12+16+...+100):(2+4+6+....+50)

2(2+4+6+8+....+50):2(1+2+3+ .....+50)

2+4+6+8+....+50=48*49/2=24*49=1176

1+2+3+...+50=50*51/2=25*51=1275

2*1176:2*1275=2352:2550=0,92

la d)nu știu să fac=)