Question

решите пример,пожалуйста,прошу вас​

Answer 1

($\frac{13}{30}$-$\frac{11}{20}$)$\frac{9}{5}$=($\frac{26}{60}$-$\frac{33}{60}$)$\frac{9}{5}$=$\frac{26*9}{300}$-$\frac{33*9}{300}$=-$\frac{63}{300}$=-0.21

Answer 2

((13/30)-(11/20))*(9/5)

1. (13/30)-(11/20)=(13*2-11*3)/60=(26-33)/60=7/60.

2. (7/60)*(9/5)=63/300=0,21.

1/((1/9)-(1/12))

1. (1/9)-(1/12)=(1*4-1*3)/36=(4-3)/36=1/36

2. 1/(1/36)=36.