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b) -5/6*(-1 1/2)*2/5=-5/6 * (-3/2) * 2/5 = 30/60=1/2
c) -2 1/2:(-1 1/4)*(-3/7)=-5/2 : (-5/4) *(-3/7) = -5/2 *(-4/5) *(-3/7) =-6/7
d)-4/9*(-4 1/2):(-1/12)=-4/9 * (-9/2) * (-12) =-24
b) -5/6*(-1 1/2)*2/5=-5/6 * (-3/2) * 2/5 = 30/60=1/2
c) -2 1/2:(-1 1/4)*(-3/7)=-5/2 : (-5/4) *(-3/7) = -5/2 *(-4/5) *(-3/7) =-6/7
d)-4/9*(-4 1/2):(-1/12)=-4/9 * (-9/2) * (-12) =-24