Question

Вычислите дробьи a) 7/15-3/5
b) 5/7+9/77
c) -1/32-29/40
d) 5/42-8/24+1/8
e) 9/13-5/26×4/9
f) 7/9÷5+4/5×7/8​

Answer 1

$\frac{7}{15} - \frac{3}{5} =$$\frac{7-9}{15} =-\frac{2}{15}$

$\frac{5}{7} +\frac{9}{77} = \frac{55+9}{77} = \frac{64}{77}$

$-\frac{1}{32} - \frac{29}{40} = \frac{-5-116}{160} =-\frac{121}{160}$

$\frac{5}{42} -\frac{8}{24} +\frac{1}{8} =-\frac{5}{56}\\1)-\frac{3}{14} +\frac{1}{8} =\frac{-12+7}{56} = -\frac{5}{56}$

$\frac{9}{13} -\frac{5}{26} *\frac{4}{9} =$$\frac{71}{117}$

$1)\frac{5}{26} *\frac{4}{9} =\frac{10}{117}$

$2)\frac{9}{13} - \frac{10}{117} =\frac{81-10}{117} = \frac{71}{117}$

$\frac{7}{9} /5+\frac{4}{5} *\frac{7}{8} =$$\frac{77}{90}$

$1)\frac{7}{9} /5=\frac{7*1}{9*5} =\frac{7}{45}$

$2)\frac{4}{5} *\frac{7}{8} =\frac{7*4}{10*4} =\frac{7}{10}$

$3)\frac{7}{45} +\frac{7}{10} =\frac{14+63}{90} =\frac{77}{90}$