Question

Calculator. 2 1 supra3 x 4supra7+9 supra5 :3 -1supra12!

Answer 1

$\frac{21}{3} \times \frac{4}{7} + \frac{9}{5} \div \frac{3 - 1}{12} = \\ = \frac{3}{3} \times \frac{4}{1} + \frac{9}{5} \times \frac{12}{2} = 3 \times 4 + \frac{9}{5} \times \frac{4}{2}$