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b)-5/6*(-1 1/2)*2/5= -5/6* (-3/2)82/5= 5/4*2/5=1/2
d)-2 1/2 :(-1 1/4) *(- 3/7) = -5/2 :(-5/4)*(-3/7)= -5/2* (-4/5) * (-3/7) =2/1*(-3/7)=-6/7
e) -4/9 *(-4 1/2) :(-1/12)= -4/9*(-9/2): (-1/12)= 2/1:(-1/12)= -24/1= -24