Question

va rog am nevoie !!!​

Answer 1

1+3+5+...+91=1+2+3+4+...+90+91-(2+4+6+...+90)=91(91+1)/2-2(1+2+3+..+45)=91*92/2-2*45(45+1)/2=91*46-45*46=46(91-45)=46*46

3+6+9+...+132+135=3(1+2+3+...+44+45)=3*45(45+1)/2=135*46/2=135*23

(1+3+5+...+91)/x=(3+6+9+...+135)/2<=>x(3+6+9+...+135)=2(1+3+5+...+91)<=>135*23x=2*46*46|:23=>135x=4*46=>x=184/135