Question

Va rog ajutatima!
Calculati si va rog si rezolvarea!
a)-6,42(8)+17,19
b)-5,009-8(45)

Answer 1

a)-6,42(8)+17,19=-(6428-642)/900+1719/100=-5786/900+1719/100=
=(-5786+15471)/900=9685/900=1937/180=10,76(1)
b)-5,009-8,(45)=-5009/1000-(845-8)/99=-5009/1000-837/99=
=-5009/1000-279/33=(-165297-279000)/33000=444297/33000=148099/11000=
=13,463(54)

Answer 2

$\displaystyle a).-6,42(8)+17,19=- \frac{6428-642}{900} + \frac{1719}{100} = \\ \\ =- \frac{5786}{900} + \frac{1719}{100} =- \frac{5786}{900} + \frac{15471}{900} = \frac{9685}{900} = \frac{1937}{180} \\ \\ b).-5,009-8,(45)=- \frac{5009}{1000} - \frac{845-8}{99} =- \frac{5009}{1000} - \frac{837}{99} = \\ \\ =- \frac{495891}{99000} - \frac{837000}{99000} =- \frac{1332891}{99000} =- \frac{148099}{11000}$