[tex]a)\frac{0.026}{1.3}+\frac{4.5}{2}=\frac{0.026\cdot \:2}{2.6}+\frac{4.5\cdot \:1.3}{2.6}=\frac{2\cdot \:0.026+1.3\cdot \:4.5}{2.6}=\frac{5.902}{2.6}=2.27 \\ \\
b)\frac{245}{0.02}+6.5\cdot \:0.3=\frac{245}{0.02}+1.95=12250+1.95=12251.95 \\ \\
c)4.2^2+\frac{2.25}{15}-1.08=17.64+\frac{2.25}{15}-1.08=17.64+0.15-1.08=16.71[/tex]
