Answer:
\[{{4}^{2}}+{{5}^{2}}+{{\underline{20}}^{2}}={{21}^{2}}\] \[{{5}^{2}}+{{\underline{6}}^{2}}+{{30}^{2}}={{31}^{2}}\] \[{{6}^{2}}+{{7}^{2}}+\underline{{{42}^{2}}}+\underline{{{43}^{2}}}\]
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