Question

12.(-3)² + √81 : 3 - (-1 - 5)²​

Answer 1

$12 \times {( - 3)}^{2} + \sqrt{81} \div 3 - {( - 1 - 5)}^{2} = \\ 12 \times {( - 3)}^{2} + 9 \div 3 - {( - 1 - 5)}^{2 } = \\ 12 \times {( -3 )}^{2} + 9 \div 3 - {( - 6)}^{2} = \\ 12 \times 9 + 9 \div 3 - 36 = \\ 108 + 3 - 36 = \\ 111 - 36 = \\ 75$