Question

O valor da expressão (2/5 - 1/2) (1/5 - 1/4)
a) 1/20 c) 1/200


b) - 120 d)N.D.A


c) 1/200

d) N.D.A

Answer 1

$( \frac{2}{5} - \frac{1}{2} )( \frac{1}{5} - \frac{1}{4} ) \\ ( \frac{ 4 - 5}{10} )( \frac{4 - 5}{20} ) \\ ( \frac{ - 1}{10} )( \frac{ - 1}{20} ) \\ = \frac{1}{200}$