(4) \( 1 \frac{2}{5} \times \square=\frac{1}{5} \)
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To solve \( 1 \frac{2}{5} \times \square = \frac{1}{5} \), let's first convert the mixed number into an improper fraction. \( 1 \frac{2}{5} = \frac{5 \cdot 1 + 2}{5} = \frac{7}{5} \). Now the equation becomes \( \frac{7}{5} \times \square = \frac{1}{5} \). To find \( \square \), we can multiply both sides by the reciprocal of \( \frac{7}{5} \), which is \( \frac{5}{7} \): \[ \square = \frac{1}{5} \times \frac{5}{7} = \frac{1}{7} \] So the answer is \( \square = \frac{1}{7} \).