Question

Вычислите : а) 87²- 174*67+67² в)38²-17²/42²-361

Answer 1

${87}^{2} - 174 \times 67 + {67}^{2} = {87}^{2} - 2 \times 67 \times 87 + {67}^{2} = {(87 - 67)}^{2} = {20}^{2} = 400 \\ {38}^{2} - \frac{ {17}^{2} }{ {42}^{2} } - 361 = 1444 - 361 - \frac{ {17}^{2} }{ {42}^{2} } = \frac{1083 \times {42}^{2} - {17}^{2} }{ {42}^{2} } =$
дальше сам)