Question

Answer 1

`-1 5/7 .15 + 2/7 .(-15) + (-105) .(2/3 -4/5 + 1/7)`

`=-12/7 .15 + 2/7 .(-15) + (-105) .1/105`

`=15 (-12/7 -2/7) - 1`

`=15 . (-2) -1`

`=-30-1`

`=-31`

Answer 2

-31 nhé

Answer 3

$-1\frac{5}{7}.15+\frac{2}{7}.(-15)+(-105).(\frac{2}{3}-\frac{4}{5}+\frac{1}{7})$

$=-\frac{12}{7}.15+\frac{2}{7}.(-15)+(-105)\frac{.1}{105}$

$=15(-\frac{12}{7}-\frac{2}{7})-1$

$=15.(-2)-1$

$=-30-1$

$=-31$