[tex] \sqrt{61 ^{2} - 60 ^{2}[/tex]
[tex] \sqrt{113 ^{2} - 112 ^{2}[/tex]
[tex] \sqrt{145 ^{2} - 144 ^{2}[/tex]
[tex] \sqrt{313 ^{2} - 312 ^{2}[/tex]
[tex] \sqrt{113 ^{2} - 112 ^{2}[/tex]
[tex] \sqrt{145 ^{2} - 144 ^{2}[/tex]
[tex] \sqrt{313 ^{2} - 312 ^{2}[/tex]
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2)(113-112)(113+112)=1*225=1*15=15
3)(145-144)(145+144)=1*289=1*17=17
4)(313-312)(313+312)=1*625=25
там корень напишешь и все)