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b)-2,646
c)-1 1/5
d)0,25
e)1,25
f)21,(3)
b).(-9,45) * 0,28 = -2,646
c).9/10 : (-3/4) = 9/10*(-4/3) = -36/30 = -1,2
d). (-0,45) : 1 4/5 = -9/20:9/5 = -9/20*5/9 = -45/180 = -1/4
e).(-2,75) : (-2,2) = 1,25
f). -9 + 5 * (-11) przez 4 - 1 = -9-13,75-1 = -23,75