Question

stabiliti regula de calcul si calculati:
1*1+1*2+1*3+1*4+.........................+1*9+1*10=
2*1+2*2+2*3+2*4+...........................+2*9+2*10=
3*1+3*2+3*3+3*4+...........................+3*9+3*10=
4*1+4*2+4*3+4*4+...........................+4*9+4*10=
5*1+5*2+5*3+5*4+...........................+5*9+5*10=
dau coroana

Answer 1

La prima este 55 A doua 110 A treia 165 A patra 220 A cincea 730