1per5×(1per4+1per5)=

Mata Pelajaran : Matematika

[tex] = \frac{1}{5} \times ( \frac{1}{4} + \frac{1}{5} ) \\ = \frac{1}{5} \times ( \frac{5}{20} + \frac{4}{20} ) \\ = \frac{1}{5} \times \frac{9}{20} \\ = \frac{1 \times 9}{5 \times 20} = \frac{9}{100} [/tex]
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