Question

Помогите пожалуйста ​

Answer 1

Ответ:

$1) \frac{1}{4} + \frac{1}{9} = \frac{9 + 4 }{36} = \frac{13}{36 } \\ \\ 2) \frac{13}{36} \div \frac{1}{9} = \frac{13 \times 9}{36} = \frac{13}{4} = 3 \frac{1}{4} \\ \\ 3) \frac{1}{4} - 3 \frac{1}{4} = - 3 \\ \\ 4) \frac{2}{5} - \frac{1}{6} = \frac{12 - 5}{30} = \frac{7}{30} \\ \\ 5) \frac{7}{15} \div \frac{7}{30} = \frac{7 \times 30}{15 \times 7} = 2 \\ \\ 6) \frac{2}{3} + 2 = 2 \frac{2}{3} \\ \\ 7) - 3 \div 2 \ \frac{2}{3} = - \frac{3 \times 3}{8} = - \frac{9}{8} = - 1 \frac{1}{8}$