Question

Considerando A= 2/3 - 14 e B= 0,7 - 0,777... como determinar A:B?

Answer 1

A=$\frac{2}{3} -14= \frac{2-42}{3} =- \frac{40}{3}$

B=$\frac{7}{10} - \frac{7}{9} = \frac{63-70}{90} =- \frac{7}{90}$

A÷B=$(- \frac{40}{3}) \div(- \frac{7}{90)} =(- \frac{40}{3} )\times(- \frac{90}{7} )= \frac{1200}{7}$

cancelei 90:3=30  ficou  (40×30)=1200