Question

13 Есепте. Салыстыр. 12 77 - 70 ҮЙ ТАПСЫРМАСЫ 55 103 - 100 + 15% 100 32 80 2 9 6 11 80 - + 19 80​

Answer 1

1)

$\frac{14}{70} \times \frac{17}{70} - \frac{13}{70} = \frac{17}{5 \times 70} - \frac{13}{70} = \\ \frac{17 - 13 \times 5}{70 \times 5} = \frac{17 - 65}{5 \times 70} = - \frac{48}{70 \times 5} = \\ - \frac{24}{35 \times 5} = - \frac{24}{175}$

2)

$\frac{13}{100} \times \frac{17}{100} + \frac{55}{100} = \frac{13 \times 17}{100 \times 100} + \frac{55}{100} = \\ \frac{221 + 55 \times 100}{100 \times 100} = \frac{221 + 5500}{10000} = \frac{5721}{10000}$

3)

$\frac{32}{80} \times \frac{11}{80} + \frac{19}{80} = \frac{2 \times 11}{5 \times 80} + \frac{19}{80} = \\ \frac{2 \times 11 + 19 \times 5}{5 \times 80} = \frac{22 + 95}{400} = \frac{117}{400}$

4)

$\frac{2}{9} \times \frac{6}{9} - \frac{5}{9} = \frac{2 \times 2}{9 \times 3} - \frac{5}{9} = \frac{2 \times 2 - 5 \times 3}{3 \times 9} = \\ \frac{4 - 15}{3 \times 9} = - \frac{11}{27}$