Question

 Rezolvati ecuatia:X*x=1+3+5+…+101

Answer 1

x*x=1+1+2+1+4+..+1+100
x*x=50+2+4+...+100
x*x=50+2*(1+2+3+..+50)
x*x=50+2*50*51/2
x*x=50+50*51
x*x=51*51
x=51

Answer 2

x*x=1+2+3+...+101+102-2-4-6-8-...-102
x*x=102*103/2-2(1+2+...+56)
x*x=103*56-2*56*57/2
x*x=103*56-56*57
x*x=56(103-57)
x*x=56*56=>x=56