Вычислите значение выражения 1. 2 1/3-1,8 2. 1,7-3 5/6+2 2/3 3. 7/9+1/3*1,6 4. 2,9*3...

Решите задачу:

$1)2\frac{1}{3}-1,8=2\frac{1}{3}-\frac{18}{10}=\frac{7}{3}-\frac{9}{5}=\frac{7*5-9*3}{15}=\frac{35-27}{15}=\frac{8}{15} \\ \\ 2)1,7-3\frac{5}{6}+2\frac{2}{3}=\frac{17}{10}-\frac{23}{6}+\frac{8}{3}=\frac{17*3-23*5+8*10}{30}= \\ \\ =\frac{51-155+80}{30}=\frac{16}{30}=\frac{8}{15}$

$3)\frac{7}{9}+\frac{1}{3}*1,6=\frac{7}{9}+\frac{1}{3}*\frac{16}{10}=\frac{7}{9}+\frac{1}{3}*\frac{8}{5}=\frac{7}{9}+\frac{8}{15}= \\ \\ =\frac{7*5+8*3}{45}=\frac{35+24}{45}=\frac{59}{45}=1\frac{14}{45} \\ \\ 4)2,9*3\frac{1}{3}-0,07*5\frac{3}{4}=\frac{29}{10}*\frac{10}{3}-\frac{7}{100}*\frac{23}{4}=\frac{29}{3}-\frac{161}{400}= \\ \\ =\frac{29*400-161*3}{1200}=\frac{11600-483}{1200}=\frac{11117}{1200}=9 \frac{317}{1200}$