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-144:4:(-6)= -36:(-6)= 6
b) 4* 25/100 - 6* 60/100= 425/100- 660/100 = -235/100 = -2,35
c) -3 * 8/10 + 2 * 5/10 +8= 38/10+ 25/10 + 8= 63/10+80/10= 143/10= 14 * 3/10= 14,3
d) 1-2+3-4+5-6= -1-1-1=-3
e) I 16 - 30I= I -14 I = 14