Question

Пжж срочно????????????
Дам 20 балл​

Answer 1

№ 1

а)  $-5 * 4,9 * (-20) = 100 * 4,9 = 490$

б) $-3(-3,5)*(-6)=-(3*3,5*6)=-(3*21)=-63$

ә) $1,44*(1\frac{19}{36} )*(-12)=\frac{144}{100}*\frac{55}{36}*(-12)=\frac{36}{25}*\frac{55}{36}*(-12 )=$

$=\frac{55}{25}*(-12)=\frac{11}{5}*(-12)= -\frac{132}{5} =-26\frac{2}{5}=-26,4$

в) $4\frac{3}{7}*(-2\frac{1}{3} )*(-\frac{7}{31} )=\frac{31}{7}*(-\frac{7}{3} )*(-\frac{7}{31} )=-1*(-\frac{7}{3} )=\frac{7}{3}=2\frac{1}{3}$

№ 2

$2\frac{1}{3}*(-1\frac{2}{7} )-(-2\frac{1}{3} )*1\frac{1}{5}=\frac{7}{3}*(-\frac{9}{7} )-(-\frac{7}{3})*\frac{6}{5}=-3+\frac{7}{3}*\frac{6}{5}=-3+7*\frac{2}{5}=-3+\frac{14}{5}=$

$=\frac{-15+14}{5}=-\frac{1}{5} =-0,2$