Question

Вычислите:
а) 63² - 126∙43+43²;   
б) 57² -3²
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24²-36.​

Answer 1

Объяснение:

$a) \: {63}^{2} - 126 \times 43 + {4 3}^{2} = \\={63}^{2} - 2 \times 63 \times 43 + {43}^{2} =\\= (63 - 43)^{2} = {20}^{2} = 400 \\ \\ b) \: \: \frac{ {57}^{2} - {3}^{2} }{ {24}^{2} - 36} = \frac{(57 - 3)(57 + 3)}{(24 - 6)(24 + 6)} =\\= \frac{54 \times 60}{18 \times 30} = \frac{3 \times 2}{1 \times 1} = 6$