Zad. 13 b) Oblicz iloczyn liczb a i b
a=5*(3\frac{1}{4}-2\frac{3}{5})=5*(3\frac{5}{20}-2\frac{12}{20})=
=5*(2\frac{25}{20}-2\frac{12}{25}=5*\frac{13}{20}=\frac{13}{4}
b=\frac{12}{17}:\frac{24}{34}=\frac{12}{17}*\frac{34}{24}=1
a*b=1*\frac{13}{4}=\frac{13}{4}