Question

cum se face: a) (1+2+...+2743):2743; b) [(2+4+...+700)•189]:[(4+8+...+360)•39] ; c) (6+12+...+258):(3+6+...+129).

Answer 1

a) (2743x2744:2) : 2743 = ...
b) [2x(1+2+3+..+350) x 189] : [4(1+2+3+...+90)x39] =
= [2x(350x351:2)x189] : [4x(90x91:2) x 39] = ...
c) 6x(1+2+...+43) : [3x(1+2+...+43)] =
=6x(43x44:2) : [3x(43x44:2)] = ...