Question

№1 (1,3,4) №4 (2,3,7) пж ​

Answer 1

1.

1)

$\frac{2}{3} + \frac{5}{6} = \frac{4}{6} + \frac{5}{6} = \frac{4 + 5}{6} = \frac{9}{6} = \frac{3}{2} = 1 \frac{1}{2}$

3)

$2 \frac{4}{5} + 7 \frac{1}{10} = 2 \frac{8}{10} + 7 \frac{1}{10} = 9 \frac{9}{10}$

4)

$\frac{4}{11} - \frac{1}{13} = \frac{52}{143} - \frac{11}{143} = \frac{52 - 11}{143} = \frac{41}{143}$

4.

2)

$- \frac{4}{11} \times \frac{33}{56} = - \frac{1}{1} \times \frac{3}{14} = - \frac{3}{14}$

3)

$3 \frac{1}{4} \times 3 \frac{9}{13} = \frac{13}{4} \times \frac{48}{13} = \frac{1}{1} \times \frac{12}{1} = 12$

7)

$- \frac{4}{5} \div ( - 1 \frac{1}{15} ) = - \frac{4}{5} \div ( - \frac{16}{15} ) = \frac{4}{5} \times \frac{15}{16} = \frac{1}{1} \times \frac{3}{4} = \frac{3}{4}$