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= 2,5 +( ⅔ - 3/2):- 1/27 = 2,5 + (4/6 - 9/6): - 1/27 = 2,5 + 13/6 : - 1/27 =
= 2,5 + 13/6 razy 27 = 2,5 + 351/6 = 25/10 + 351/6 = 75/30 + 1755/30 =
= 1830/30 = 61
b)5×[0,4-0,4:(-2)]+0,5-52×0,2+90= 5[0,4 + 0,2] + 0,5 - 10,4 + 90 = 5(0,6) + 80,1 =
= 3 + 80,1 = 83,1
=2,5 + (2/3 - 9/5*5/6) : (-1/27) =
= 2,5 + (2/3 - 3/2) : (-1/27)=
= 2,5 + ( 4/6 - 9/6) : (-1/27)=
=2,5 + ( -5/6)*(-27/1) =
= 2,5 + 45/2 =
= 2,5 + 22,5 =
= 25
b)5×[0,4-0,4:(-2)]+0,5-52×0,2+90=
= 5 *[2/5 - 2/5*(-1/2)] + 0,5 - 10,4 + 90 =
= 5 *[2/5 + 1/5] + 80,1=
= 5*3/5 + 80,1=
= 3 + 80,1 =
= 83,1