Question

1,3-2 1/4:9)*(-10)-13

Answer 1

(1,3-2 1/4:9)*(-10)-13=
(1,3-9/4:9)*(-10)-13=
(1,3-1/4)*(-10)-13=
(1,3-0,25)*(-10)-13=
(1,3-0,25)*(-10)-13=
1,05*(-10)-13=
-10,5 -13=
-23,5