Question

Дам 18 баллов
Только помогите

Answer 1

Ответ:

Пошаговое объяснение:

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

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

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

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

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

Answer 2

$1);frac{72}{73}cdotfrac{34}{65}+frac{72}{73}cdotfrac{39}{65}=frac{72}{73}cdotleft(frac{34}{65}+frac{34}{65}right)=frac{72}{73}cdotfrac{73}{65}=frac{72}{65}=1frac7{65};$

$2);72cdotleft(frac{19}{24}-frac7{12}+frac38right)=72cdotleft(frac{19}{24}-frac{14}{24}+frac9{24}right)=72cdotfrac{14}{24}=3cdot14=42;$

$3);15cdotleft(1+frac13-frac15right)=15cdotleft(frac{15}{15}+frac5{15}-frac3{15}right)=15cdotfrac{17}{15}=17;$

$4);frac{18}7cdotfrac49+frac{15}{14}=frac27cdot4+frac{15}{14}=frac87+frac{15}{14}=frac{16}{14}+frac{15}{14}=frac{31}{14}=2frac3{14};$

$5);frac85cdotfrac34+frac{11}8=frac25cdot3+frac{11}8=frac65+frac{11}8=frac{48}{40}+frac{55}{40}=frac{103}{40}=2frac{23}{40}$