Question

me ajudem!!!!!!!!!!!!!!!!!!! urgente​

Answer 1

1)

$- \frac{5}{8} + \frac{3}{10} = \frac{ - 25 + 12}{40} = - \frac{13}{40}$

2)-1,9+2+3,25-1,45=5,25-3,35=1,9.

3)

$\frac{1}{3} - ( - \frac{1}{2} + \frac{3}{4} ) + ( - 1 + \frac{5}{6} )$

$\frac{1}{3} - ( \frac{ - 2 + 3}{4} ) + ( \frac{ - 6 + 5}{6} ) \\ \frac{1}{3} - \frac{1}{4} - \frac{1}{6}$

$= \frac{4 - 3 - 2}{12} = - \frac{1}{12}$

4) 1,6-(-2,8)+[1,9-(-5,6+8,1)]

1,6+2,8+[1,9+5,6-8,1]

4,4-0,6=3,8

5) -2,5-(-12,7)=-2,5+12,7=10,2°C