Question

 ME AJUDEMMMMM 
determinar o valor das expressoes
a)-(-2)ao quadrado-raiz cubica de 27


b)(1/4)ao quadrado x 4/5+2/5: (2/3)ao quadrado


c)1/4+0,09:(4-0,8:0,5-1/2)

Answer 1

A)-(-2)²-³√27
   -4-3
    -7

B)(1/4)² * 4/5+2/5:(1/3)²
    1/16*4/5+2/5:1/9
     4/80+18/5
      4/80+34/80
         38/80

C)0,25+0,09:(4-0,8:0,5-0,5)
   0,25+0,09/(4-0,8/0)
   0,25+0,09/4
   0,25+0,0225
   0,2725