Question

folosind forma lui gauss 1+2+3+......+100. 1+2+3+.......405. 1+2+3.........399. 1+2+3.......597. 2+4+6......+400. 3+6+9.....+300. 5+10+15......+555

Answer 1

a.100•101:2=10.100:2=5.050
b.405•406:2=164.430:2=82215
c.399•400:2=159.600:2=.... (scz calculeaza tu... :| )
si nu mai stiu.... poate descoperi regula... scuzee

Answer 2

a ) ( 1+100) × 100:2
101×50
=5050
b) (1+405)×405:2
406×405:2
405×406:2 aici am folosit o propietate
405×203
= 822.15
c) (1+399)×399:2
400×399:2
399×400:2 aici am folosit o propietate
399×200
=79.800
Doar atat am reusit sa rezolv