Question

Дам 18 баллов
Только помогите

Answer 1

Ответ:

Пошаговое объяснение:

$1) \frac{72}{73}*\frac{34}{65} +\frac{72}{73}*\frac{3}{5}=\frac{2448}{4745} +\frac{72}{73}*\frac{3}{5} = \frac{2448}{4745}+\frac{216}{365}=\frac{72}{65}=1\frac{7}{65}$

$2) 72*\frac{7}{12} =6*7=42$

$3) 15*\frac{17}{15}=17$

$4) \frac{2}{7} *4+\frac{15}{14}=\frac{8}{7}+\frac{15}{14} =\frac{31}{14}=2\frac{3}{4}$

$5) \frac{2}{5}*3+\frac{11}{8}=\frac{6}{5}+\frac{11}{8}=\frac{103}{40} =2\frac{23}{40}$

Answer 2

$1)\;\frac{72}{73}\cdot\frac{34}{65}+\frac{72}{73}\cdot\frac{39}{65}=\frac{72}{73}\cdot\left(\frac{34}{65}+\frac{34}{65}\right)=\frac{72}{73}\cdot\frac{73}{65}=\frac{72}{65}=1\frac7{65};$

$2)\;72\cdot\left(\frac{19}{24}-\frac7{12}+\frac38\right)=72\cdot\left(\frac{19}{24}-\frac{14}{24}+\frac9{24}\right)=72\cdot\frac{14}{24}=3\cdot14=42;$

$3)\;15\cdot\left(1+\frac13-\frac15\right)=15\cdot\left(\frac{15}{15}+\frac5{15}-\frac3{15}\right)=15\cdot\frac{17}{15}=17;$

$4)\;\frac{18}7\cdot\frac49+\frac{15}{14}=\frac27\cdot4+\frac{15}{14}=\frac87+\frac{15}{14}=\frac{16}{14}+\frac{15}{14}=\frac{31}{14}=2\frac3{14};$

$5)\;\frac85\cdot\frac34+\frac{11}8=\frac25\cdot3+\frac{11}8=\frac65+\frac{11}8=\frac{48}{40}+\frac{55}{40}=\frac{103}{40}=2\frac{23}{40}$