1" alt="\frac{42}{10}+4b>1" align="absmiddle" class="latex-formula">
1-\frac{42}{10}" alt="4b>1-\frac{42}{10}" align="absmiddle" class="latex-formula">
\frac{10-42}{10}" alt="4b>\frac{10-42}{10}" align="absmiddle" class="latex-formula">
-\frac{32}{10}" alt="4b>-\frac{32}{10}" align="absmiddle" class="latex-formula">
-\frac{8}{10}" alt="b>-\frac{8}{10}" align="absmiddle" class="latex-formula">
-\frac{4}{5}" alt="b>-\frac{4}{5}" align="absmiddle" class="latex-formula">
Ответ: при любых натуральных значениях b дробь будет неправильной.