Question

136. Обчисліть:
1) 4²+7²;
2) 9²-5²;
3) 18²:36-3²;
4) 18²: (36-3²).

Answer 1

${4}^{2} + {7}^{2} = 16 + 49 = 63 \\ {9}^{2} - {5}^{2} = 81 - 25 = 56 \\ {18}^{2} \div 36 - {3}^{2} =324 \div 36 - 9 = 9 - 9 = 0 \\ {18}^{2} \div (36 - 3 {}^{2} ) = 324 \div 27 = 12$