Question

номера 833 834 умоляю люди мне 11 лет помогите!!!

Answer 1

$833.\\a)\;\left(\frac45-\frac{11}{15}\right)\cdot\frac5{11}=\left(\frac{12}{15}-\frac{11}{15}\right)\cdot\frac5{11}=\frac1{15}\cdot\frac5{11}=\frac13\cdot\frac1{11}=\frac1{33}\\b)\;\frac7{88}\cdot\left(\frac8{21}+\frac87\right)=\frac7{88}\cdot\left(\frac8{21}+\frac{24}{21}\right)=\frac7{88}\cdot\frac{32}{21}=\frac1{11}\cdot\frac43=\frac4{33}\\c)\;\frac37\cdot\left(\frac14+\frac7{12}\right)=\frac37\cdot\left(\frac3{12}+\frac7{12}\right)=\frac37\cdot\frac{10}{12}=\frac17\cdot\frac{10}4=\frac{10}{28}$

$834.\\a)\;\frac14+\frac38\cdot1\frac23=\frac14+\frac38\cdot\frac53=\frac14+\frac58=\frac28+\frac58=\frac78\\b)\;1\frac16\cdot\frac3{14}-\frac1{10}=\frac76\cdot\frac3{14}-\frac1{10}=\frac12\cdot\frac12-\frac1{10}=\frac14-\frac1{10}=\frac5{20}-\frac2{20}=\frac3{20}\\c)\;3\frac16\cdot1\frac12-4=\frac{19}6\cdot\frac32-4=\frac{19}2\cdot\frac12-4=\frac{19}4-4=4\frac34-4=\frac34$