Question

calcule o valor das expressões

a) -1,5-(+0,4)-(-0,32)=?

b)-1,75-(0,6+1,2+1,05)=?

me ajudem

Answer 1

a) -1,5-(+0,4)-(-0,32)=?
- $\frac{15}{10}$ - $\frac{4}{10}$ + $\frac{32}{100}$
- $\frac{3}{2}$ - $\frac{2}{5}$ + $\frac{8}{25}$
$\frac{-75-20+16}{50}$ 
R= $\frac{-79}{50}$ 

b)-1,75-(0,6+1,2+1,05)=?
- $\frac{175}{100}$ - ($\frac{6}{10}$ + $\frac{12}{10}$ + $\frac{105}{100}$)
- $\frac{175}{100}$ - ($\frac{3}{5}$ + $\frac{6}{5}$ + $\frac{21}{20}$)
- $\frac{175}{100}$ - ($\frac{12+24+21}{20}$)
- $\frac{175}{100}$ - $\frac{57}{20}$
- $\frac{175}{100}$ - $\frac{285}{100}$
- $\frac{460}{100}$
R= -4,6 ou -$\frac{23}{5}$