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-3,25*1 1/2= -13/4 * 3/2 = -39/8 = -4 7/8
3,125*2 1/2=3 1/8 * 5/2 = 25/8 *5/2 = 125/16 = 7 13/16
2 2/3*(-1 7/8)=8/3 * (-15/8) = -5
-11*0,345= -0,375
4,125*(-7/11)= 33/8 * (- 7 / 11) = -3/42 = -1/14