Question

срочно дам 30 б.!!!!!!!!​

Answer 1

1) 6

-13-(-19) = -13+19 = 6

2) 34,79

(17,9+(-4,5)) - (-14,76 - 6,63) = 17,9 - 4,5 + 21,39 = 13,4+21,39 = 34,79

3) 4,9

$4 - \frac{4}{15} - ( - 1 \frac{1}{3} ) + ( - \frac{1}{6} ) = \\ 4 - \frac{8}{30} + 1 \frac{10}{30} - \frac{5}{30} = \\ 4 + 1 \frac{10}{30} - \frac{13}{30} =4 + \frac{40 - 13}{30} = \\ 4 + \frac{27}{30} = 4 + \frac{9}{10} = 4 \frac{9}{10} = 4.9$

4) 2 ; -5,5

$|x + 1.75| = 3.75 \\ 1)x + 1.75 =3.75 \\ x _{1} = 3.75 - 1.75 \\x _{1} = 2 \\ 2)x + 1.75 = - 3.75 \\ x_{2} = - 3.75 - 1.75 \\ x_{2} = - 5.5$