\(\frac{1}{4}\cdot45+0.25\cdot35+\frac{25}{100}\cdot19+25\%\)
\(=0.25\cdot45+0.25\cdot35+0.25\cdot19+0.25\)
\(=0.25\left(45+35+19+1\right)\)
\(=0.25\cdot100\)
\(=25\)
\(=0,25.45+0,25.35+0,25.19+0,25.1\)
\(=0,25.\left(45+35+19+1\right)\)
\(=0,25.100\)
\(=25\)