Explicație pas cu pas:
e)
{637+15×[15×(282:47+516:43):45-6]:21}:13 =
= {637+15×[15×(6+12):45-6]:21}:13
= [637+15×(15×18:45-6):21]:13
= [637+15×(6-6):21]:13
= (637+15×0:21):13
= (637+0):13
= 637:13
= 49
f)
(6+12+18+24+...600)² ÷ (3+6+9+...+300) ÷ (1+2+3+...+100) = [6×(1+2+3+...100)]² ÷ [3×(1+2+3+...+100) × (1+2+3+...+100)] = 36×(1+2+3+...+100)² ÷ [3×(1+2+3+...+100)²] = 36 ÷ 3 = 12
