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b =-72
*-1
*-1.35
*0,930(5)
b) -12 + 12 * [-(-6) / 3 - 3] = -12 +12* [2-3}= -12+12*(-1)= -12 -12 = -24
c) 0,75 * ( -⁴/₅) - 2 ½ * (0,24) = 0,75 *(-0,8) - 2,5 * 0,24 = -0,6 -0,6 = 1,2