Question

Срочно! Даю 22 балла!

Answer 1

$1.\\a)\;\frac37+\frac56=\frac{18+35}{56}=\frac{53}{56}\\b)\;\frac{11}{12}-\frac78=\frac{44-42}{48}=\frac2{48}=\frac1{24}\\c)\;\frac5{14}\cdot\frac7{30}=\frac12\cdot\frac16=\frac1{12}\\d)\;1\frac8{25}\cdot1\frac4{11}=\frac{33}{25}\cdot\frac{15}{11}=\frac35\cdot\frac31=\frac95=1\frac45\\e)\;\frac59:\frac{10}{27}=\frac59\cdot\frac{27}{10}=\frac11\cdot\frac32=\frac32=1\frac12\\f)\;4\frac49:1\frac23=\frac{40}9:\frac53=\frac{40}9\cdot\frac35=\frac83\cdot\frac11=\frac83=2\frac23$

$2.\;\left(x+2\frac56\right):20+7\frac15=7\frac12\\\left(x+2\frac56\right):20=7\frac12-7\frac15\\\left(x+2\frac56\right):20=7\frac5{10}-7\frac2{10}\\\left(x+2\frac56\right):20=\frac3{10}\\x+2\frac56=\frac3{10}\cdot20\\x+2\frac56=6\\x=6-2\frac56\\x=3\frac16$

$3.\\a)\;240:\frac67=240\cdot\frac76=40\cdot7=280\;\Gamma a\\b)\;210\cdot\frac35=42\cdot3=126\;Py\delta.$

$4.\;4\frac59-2\frac56=4\frac{10}{18}-2\frac{15}{18}=1\frac{13}{18}\;-\;BO\;BTOPOM\\4\frac59+1\frac{13}{18}=4\frac{10}{18}+1\frac{13}{18}=5\frac{23}{18}=6\frac5{18}\;-\;B\;DBYX.$

$5.\;x:7=5\frac47\\x:7=\frac{39}7\\x=\frac{39}7\cdot7\\x=39$