Question

20*(3+6+9+.....+300):(2+4+6+......+200):6

Answer 1

in prima paranteza dam 3 factor comun si in a doua il dam pe 2 factor comun

20*3*(1+2+3+....+100):2*(1+2+3+....+100):6=
60*[(100*101):2] : 2[(100*101):2] :6=
60*(10100:2) : 2(10100:2) :6=
(60 * 5050) : (2 * 5050) :6=
303000 : 10100 : 6=
30 : 6= 5