Răspuns :
Răspuns:
1) 5²⁰-5¹⁶=5¹⁶(5⁴-1)=5¹⁶(625-1)=624·5¹⁶
2) 7³⁰-7²⁸=7²⁸(7²-1)=7²⁸(49-1)=48·7²⁸
3) 7³³-7³²-7³¹=7³¹(7²-7-1)=7³¹(49-8)=41·7³¹
4) 11²¹-11²⁰-11¹⁹=11¹⁹(11²-11-1)=11¹⁹(121-12)=109·11¹⁹
5) 13⁷-13⁶+13⁵=13⁵(13²-13+1)=13⁵(169-12)=157·13⁵
Explicație pas cu pas: