Ответ:\(2^2-1^2=4-1=3\).\(3^2-2^2=9-4=5\).\(4^2-3^2=16-9=7\).\(10^2-9^2=100-81=19\).\(12^2-11^2=144-121=23\).\(15^2-14^2=225-196=29\).