Question

$\sqrt{ {240 }^{2} + {180}^{2} }$
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Answer 1

240^2=57600
180^2=32400
57600+32400=90000
Корень из 90000=300

Answer 2

$\displaystyle \sqrt{240^{2}+180^{2}}=\sqrt{(200+40)^{2}+(200-20)^{2}}=\\\\=\sqrt{40000+16000+1600+40000-8000+400}=\\\\=\sqrt{80000+10000}=\sqrt{90000}=300;$