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j) 17,21 - 20,03= -2,82
k) -0,82 * (-0,3)= (-82/100) * (-3/10)= 246/1000= 0,246
l) -0,75 - (1 i 2/3)= (-3/4) - 5/3= (-9/12) - 20/12= -29/12