Wykonajmy obliczenia pierwszym sposobem:

$\left(2\frac{1}{8}+3,75-2\frac{3}{5}\right)\cdot 1\frac{1}{2}=$

$=\left(2\frac{1}{8}+3\frac{75}{100}-2\frac{3}{5}\right)\cdot \frac{3}{2}=$

$=\left(2\frac{1}{8}+3\frac{3}{4}-2\frac{3}{5}\right)\cdot \frac{3}{2}=$

$=\left(2\frac{5}{40}+3\frac{30}{40}-2\frac{24}{40}\right)\cdot \frac{3}{2}=$

$=\left(5\frac{35}{40}-2\frac{24}{40}\right)\cdot \frac{3}{2}=$

$=3\frac{11}{40}\cdot \frac{3}{2}=\frac{131}{40}\cdot \frac{3}{2}=$

$=\frac{393}{80}=4\frac{73}{80}$

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Drugi sposób:

$\left(2\frac{1}{8}+3,75-2\frac{3}{5}\right)\cdot 1\frac{1}{2}=$

$=\left(2,125+3,75-2,6\right)\cdot 1,5=$

$=\left(5,875-2,6\right)\cdot 1,5=$

$=3,275\cdot 1,5=4,9125$