Question

calcule as expressões numéricas simplificado quando for possível [1-(3/4+1/5]÷3/40

Answer 1

$[1-(\frac{3}{4}+\frac{1}{5})]:\frac{3}{40} =$

$[1- \frac{19}{20}]: \frac{3}{40} =$

$\frac{1}{20}: \frac{3}{40} =$

$\frac{1}{20}.\frac{40}{3} = \frac{40^{:20} }{60^{:20} } = \frac{2}{3}$

Espero ter ajudado!