Question

calcule o valor do número A. A=(+0,4) : (-0,02) -9 × (-1,8)​

Answer 1

$A=(+0,4):(0,02)-9.(-1,8)\\\\A=(\frac{4}{10} ):(\frac{2}{100} )-9.(-\frac{18}{10})\\\\A=(\frac{4}{10} ).(\frac{100}{2})+\frac{162}{10}\\\\A=\frac{400}{20}+\frac{162}{10}\\\\A=\frac{400}{20}+\frac{324}{20}\\\\A=\frac{724}{20}\\\\A=\frac{181}{5}$