Question

Срочно! Даю 22 балла!

Answer 1

$1.\a);frac37+frac56=frac{18+35}{56}=frac{53}{56}\b);frac{11}{12}-frac78=frac{44-42}{48}=frac2{48}=frac1{24}\c);frac5{14}cdotfrac7{30}=frac12cdotfrac16=frac1{12}\d);1frac8{25}cdot1frac4{11}=frac{33}{25}cdotfrac{15}{11}=frac35cdotfrac31=frac95=1frac45\e);frac59:frac{10}{27}=frac59cdotfrac{27}{10}=frac11cdotfrac32=frac32=1frac12\f);4frac49:1frac23=frac{40}9:frac53=frac{40}9cdotfrac35=frac83cdotfrac11=frac83=2frac23$

$2.;left(x+2frac56right):20+7frac15=7frac12\left(x+2frac56right):20=7frac12-7frac15\left(x+2frac56right):20=7frac5{10}-7frac2{10}\left(x+2frac56right):20=frac3{10}\x+2frac56=frac3{10}cdot20\x+2frac56=6\x=6-2frac56\x=3frac16$

$3.\a);240:frac67=240cdotfrac76=40cdot7=280;Gamma a\b);210cdotfrac35=42cdot3=126;Pydelta.$

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

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