Question

Все примеры, но решение не в крации, а полное. Очень срочно!

Answer 1

$\displaystyle 714).\\\\ 1). \ \ \frac{1}{2}+\frac{2}{5}=\frac{1*5}{2*5}*\frac{2*2}{5*2}=\frac{5}{10}+\frac{4}{10}=\frac{9}{10}=0,9;\\\\2). \ \ \frac{1}{2}+\frac{1}{3}=\frac{1*3}{2*3}+\frac{1*2}{3*2}=\frac{3}{6}+\frac{2}{6}=\frac{5}{6};\\\\ 3). \ \ \frac{2}{3}+\frac{1}{4}=\frac{2*4}{3*4}+\frac{1*3}{4*3}=\frac{8}{12}+\frac{3}{12}=\frac{11}{12};\\\\4). \ \ \frac{3}{5}+\frac{3}{4}=\frac{3*4}{5*4}+\frac{3*5}{4*5}=\frac{12}{20}+\frac{15}{20}=\frac{27}{20}=1\frac{7}{20}=1,35;$

$\displaystyle 5). \ \ \frac{3}{5}+\frac{2}{3}=\frac{3*3}{5*3}+\frac{2*5}{3*5}=\frac{9}{15}+\frac{10}{15}=\frac{19}{15}=1\frac{4}{15};\\\\ 6). \ \ \frac{3}{4}+\frac{2}{5}=\frac{3*5}{4*5}+\frac{2*4}{5*4}=\frac{15}{20}+\frac{8}{20}=\frac{23}{20}=1\frac{3}{20}=1,15;$

$\displaystyle 715).\\\\1).\ \ \frac{1}{4}+\frac{1}{6}=\frac{3}{12}+\frac{2}{12}=\frac{5}{12};\\\\2).\ \ \frac{1}{6}+\frac{7}{8}=\frac{4}{24}+\frac{21}{24}=\frac{25}{24}=1\frac{1}{24};\\\\3).\ \ \frac{3}{10}+\frac{2}{15}=\frac{9}{30}+\frac{4}{30}=\frac{13}{30};\\\\4).\ \ \frac{5}{12}+\frac{1}{18}=\frac{15}{36}+\frac{2}{36}=\frac{17}{36};\\\\5).\ \ \frac{3}{20}+\frac{11}{30}=\frac{9}{60}+\frac{22}{60}=\frac{31}{60};\\\\6).\ \ \frac{1}{30}+\frac{2}{45}=\frac{3}{90}+\frac{2}{90}=\frac{5}{90}= \frac{1}{18};$

$\displaystyle 716).\\\\1). \ \ \frac{7}{10}+\frac{4}{15}= \frac{21}{30}+\frac{8}{30}= \frac{29}{30};\\\\2). \ \ \frac{7}{24}+\frac{11}{36}=\frac{21}{72}+\frac{22}{72}= \frac{43}{72};\\\\3). \ \ \frac{4}{77}+\frac{10}{11}=\frac{4}{77}+\frac{70}{77}= \frac{74}{77};\\\\4). \ \ \frac{13}{24}+\frac{2}{15}=\frac{65}{120}+\frac{16}{120}=\frac{81}{120}= \frac{27}{40}=0,675;\\\\5). \ \ \frac{4}{45}+\frac{11}{60}=\frac{16}{180}+\frac{33}{180}= \frac{49}{180};\\\\6). \ \ \frac{5}{48}+\frac{5}{36}= \frac{15}{144}+\frac{20}{144}= \frac{35}{144};$