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2013-04-07T18:01:44+02:00

A = 6/7 -4/7 x 5/2

A = 6/7 - 20/14

A = 12/14 -20/14 = 8/14 = 4/7

 

B = 3/4 -4  : 3/4 +1/3

B = 3/4 - 16/4 : 9/12 + 4/12

B = -13/4 : 13/12

B = -13/4 x 12/13

B = -156/52 = -78/26 = - 39/13 = -3

 

C = 3² x 2 - 125 x 10^6

C = 18 - 12.5 = 5.5

 

D = 3.2 x 5 x 10^-5 x 10^6 : 4 x 10^-2

D = 16 x 10 : 4 x 10^-2

D = 4 x 10^3