Question

Помогите пожалуйста
Пример 3 и пример б

Answer 1

3)

$frac{-z}{0.8} = 4.5 \ \ -z = 4,5*0,8 \ \ -z = 3,6 \ \ z = -3,6$

б)

$frac{-2frac{4}{7}*6.4*(-0.45)*(- frac{10}{11})*0.5}{frac{3}{11}*(-0.72)*(-3 frac{3}{7} )} = frac{-frac{18}{7}*frac{64}{10} *frac{45}{100}*frac{10}{11}* frac{5}{10}}{frac{3}{11}*frac{72}{100} *frac{24}{7} }= frac{-frac{18*64*45*5}{7*100*11*10} }{frac{3*72*24}{11*100*7}}= \ \ =-frac{18*64*45*5*11*100*7}{7*100*11*10*3*72*24} }=-frac{18*64*45*5}{10*3*72*24} }=-frac{9*2*8*8*45*5}{5*2*3*9*8*24} } =-frac{8*45}{3*24} }= \ \ =-frac{4*2*3*5*3}{3*2*3*4} }= -5$

Answer 2

3
-z=4,5*0,8
-z=3,6
z=-3,6
б
1)-2 4/7*(-10/11)=18/7*10/11=180/77
2)6,4*(-0,45)*0,5=-2,88*0,5=-1,44
3)180/77*(-1 44)=-180/77*144/100=1296/385
4)3/11*(-3 3/7)=-3/11*24/7=-72/77
5)(-0,72)*(-72/77)=72/100*72/77=1296/1925
6)1296/385:1296/1625=1296/385*1925/1296==5