Question

помогите срочно пожалуйста)

Answer 1

$555.;1);frac{0,75:0,15-2,5}{8,4:2,1+2,25}=frac{5-2,5}{4+2,25}=frac{2,5}{6,25}=frac{2,5}{(2,5)^2}=frac1{2,5}=frac4{10}=0,4$

$556.;1);frac{8,5cdot3frac17cdot3,8}{1,7cdot1frac47cdot1frac9{10}}=frac{8frac12cdot3frac17cdot3frac45}{1frac7{10}cdot1frac47cdot1frac9{10}}=frac{frac{17}2cdotfrac{22}7cdotfrac{19}5}{frac{17}{10}cdotfrac{11}7cdotfrac{19}{10}}=frac{frac{17}1cdotfrac{11}7cdotfrac{19}5}{frac{17}{10}cdotfrac{11}7cdotfrac{19}{10}}=frac{17cdot11cdot19cdot10cdot7cdot10}{17cdot11cdot19cdot1cdot7cdot5}=\=2cdot10=20$