câte numere naturale de trei cifre exista, stiind ca prima
si ultima cifră sunt identice;
Răspunsuri la întrebare
Răspuns:
101,,121,131,141,151,161,171,181,191
202,212,232,242,......292
303.......
........
909
Sunt 9 randuri a cate 9 numere fiecare
9*9=81 numere exista
Explicație pas cu pas:
Spor la scris! Sper ca te am ajutat!
Răspuns:
89
Explicație pas cu pas:
Ei bine numerele sunt 101,111,121,131,141,151,161,171,181,191,202,212,222,232,242,252,262,272,282,292,303,313,323,333,343,353,363,373,383,393,404,414,424,434,444,454,464,474,484,494,505,515,525,535,545,555,565,575,585,595,606,616,626,636,646,656,666,676,686,696,707,717,727,737,747,757,767,777,787,797,808,818,828,838,848,858,868,878,888,898,909,919,929,939,949,959,969,979,989,999.
__________________________________________________________
__________________________________________________________
Acum le vom număra si așa vom afla rezultatul.