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a) 64 x (-3/8) x (-1 1/2)=64*(-3/8)*(-3/2)=64*9/16=36
b)2 1/7 x 1 2/5 x (-2,5)=1/7*7/5*(-2/5)=-2/25
c)(-3) x 5 1/6 - (-4 1/2) x (-2 1/3)=(-3)*31/6+9/2*(-7/3)=-9/6+63/6=54/6=9/6=1 3/6
d) -6 : (3,6 - 2 2/5)=-1/6*(36/10-12/5)=-1/6(36/10-24/10)=-1/6*6/10=-1/10
e) -4 1/5 : 5 3/5 - 2 1/4 : (-1 1/4)=-21/5*5/28-9/4*(-4/5)=-21/28-9/5
zad.2
a= 4,5 : 3/5 - 0,5 x 10=45/10*5/3-1/2*10=15/2-5=15/2-10/2=5/2=2 1/2
b= 4,5 x (1 2/5 - 2,4) : 1,5=45/10*(7/5-24/10)=45/10*(14/10-24/10)=45/10*(-10/10)=9/2=4 1/2