Question

помогите пж! 66 балов даю

Answer 1

Ответы с пошаговым объяснением:

1. $-6,2*1,9=-11,78$

$-25,65:(-3,42)=25,65:3,42=7,5$

$0,87*(-25)=-21,75$

$-3,5*(-0,65)=3,5*0,65=2,275$

$14,31:5,3=2,7$

$-\frac{3}{14} *0,2=-\frac{3}{14} *\frac{1}{5} =-\frac{3}{70}$

$-0,4:(-\frac{8}{11} )=-\frac{2}{5} :(-\frac{8}{11} )=\frac{2}{5} :\frac{8}{11} =\frac{2}{5} *\frac{11}{8} =\frac{11}{20}$

$\frac{7}{8}:63=\frac{7}{8} *\frac{1}{63} =\frac{1}{72}$

$-2\frac{2}{9} :\frac{35}{81} =-\frac{20}{9} :\frac{35}{81} =-\frac{20}{9} *\frac{81}{35}=-\frac{4}{1} *\frac{9}{7} =-\frac{36}{7} =-5\frac{1}{7}$

2. $(a-b)*c+6$

$(-4,8-(-3))*\frac{1}{3}+6=-1,8*\frac{1}{3} +6=-\frac{9}{5} *\frac{1}{3} +6=-\frac{3}{5} +6=\frac{27}{5} =5\frac{2}{5}$

$(1-(-12))*0,2+6=13*0,2+6=2,6+6=8,6$$(6\frac{2}{3}-(-\frac{1}{3}))*2,5+6=(\frac{20}{3} +\frac{1}{3} )*2,5+6=7*2,5+6=17,5+6=23,5$

$(-2,8-(-3,7))*\frac{3}{2} +6=0,9*\frac{3}{2} +6=\frac{9}{10} *\frac{3}{2} +6=\frac{27}{20} +6=\frac{147}{20} =7\frac{7}{20}=7,35$

$(5,7-\frac{3}{10} )*1,2+6=\frac{57}{10} -\frac{3}{10} *\frac{6}{5} +6=\frac{27}{5} *\frac{6}{5} +6=\frac{162}{25} +6=\frac{312}{25}=12\frac{12}{25} =12,48$

3. $1,2-l:k$

$1,2-3,6:(-1,2)=1,2-\frac{18}{5}:(-\frac{6}{5} ) =1,2 +\frac{18}{5} *\frac{5}{6} =1,2+3=4,2$

$1,2-\frac{2}{3} :\frac{2}{9} =1,2-\frac{2}{3} *\frac{9}{2} =1,2-3=-1,8$

$1,2-0,6:(-20)=\frac{6}{5} -\frac{3}{5} :(-20)=\frac{6}{5} +\frac{3}{5} *\frac{1}{20} =\frac{6}{5} +\frac{3}{100} =\frac{123}{100} =1\frac{23}{100} =1,23$$1,2-1\frac{1}{7} :\frac{3}{14}=\frac{6}{5}-\frac{8}{7} *\frac{14}{3} =\frac{6}{5} -\frac{16}{3} =-\frac{62}{15}=-4\frac{2}{15} =-4,13$

$1,2-4\frac{1}{10} :20,5=\frac{6}{5} -\frac{41}{10} :\frac{41}{2} =\frac{6}{5} -\frac{41}{10}*\frac{2}{41} =\frac{6}{5} -\frac{1}{5} =1$