[tex]\displaystyle\bf\\42,8\cdot\frac{5}{8} -2,8\cdot \frac{5}{8} =\frac{5}{8} \cdot(42,8-2,8)=\frac{5}{8} \cdot 40=5\cdot 5=25[/tex]
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[tex]\displaystyle\bf\\42,8\cdot\frac{5}{8} -2,8\cdot \frac{5}{8} =\frac{5}{8} \cdot(42,8-2,8)=\frac{5}{8} \cdot 40=5\cdot 5=25[/tex]