344 1) 1132 – 1122; 3) √652-632; 2) √822-182; 4) √3132-3122.

1) $$113^2 - 112^2 = (113-112)(113+112) = 1 \cdot 225 = 225$$.

3) $$√{65^2 - 63^2} = √{(65-63)(65+63)} = √{2 \cdot 128} = √{256} = 16$$.

2) $$√{82^2 - 18^2} = √{(82 - 18)(82 + 18)} = √{64 \cdot 100} = 8 \cdot 10 = 80$$.

4) $$√{313^2 - 312^2} = √{(313-312)(313+312)} = √{1 \cdot 625} = 25$$.

Ответ: 1) 225; 2) 80; 3) 16; 4) 25.