Question

1. 5+2/3*(-2 1/2)=
2. -2: 5 1/3-7/10: 1 1/15=
3. 2 1/5*1/3+(-3/10):4 1/2
4. 3/7-(1 1/4-1 1/8*2/9)
пж за 10мин!!!​

Answer 1

Ответ:

Пошаговое объяснение:

$1)5+\frac{2}{3}*(2\frac{1}{2})=5+\frac{2}{3}*\frac{5}{2}=5+\frac{5}{3}=5+1\frac{2}{3}=6\frac{2}{3}\\\\2)-2:5\frac{1}{3}-\frac{7}{10}:1\frac{1}{15}=-2:\frac{16}{3}-\frac{7}{10}:\frac{16}{15}=-2*\frac{3}{16}-\frac{7}{10}*\frac{15}{16}=-\frac{3}{8}-\frac{21}{32}=\frac{-12-21}{32}=-\frac{33}{32}=-1\frac{1}{32}\\\\3)2\frac{1}{5}*\frac{1}{3}+(-\frac{3}{10}):4\frac{1}{2}=\frac{11}{5}*\frac{1}{3}+(-\frac{3}{10})*\frac{2}{9}=\frac{11}{15}-\frac{3}{45}=\frac{2}{3}\\\\4)\frac{3}{7}-(1\frac{1}{4}$$4)\frac{3}{7}-(1\frac{1}{4}-1\frac{1}{8}*\frac{2}{3})=\frac{3}{7}-(\frac{5}{4}-\frac{9}{8}*\frac{2}{3})=\frac{3}{7}-(\frac{5}{4}-\frac{3}{4})=\frac{3}{7}-\frac{1}{2}=-\frac{1}{14}$