Question

19,25*5/11+5,76*5/12-13,009

Answer 1

1. 19,25*(5/11)=19¹/₄*(5/11)=(77/4)*(5/11)=77*5/(4*11)=35/4.

2. 5,76*(5/12)=5¹⁹/₂₅*(5/12)=(144/25)*(5/12)=144*5/(25*12)=12/5.

3. (35/4)+(12/5)=(35*5+12*4)/20=(175+48)/20=223/20=11,15.

4. 11,15-13,009 =-1,859.