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b) |-4 + 2,8| - |2 1/2 - 10|=1,2-7,5= -6,3
c) |-2/3| * |4 - 5,8|=2/3*1,8=2/3*18/10=6/5=1 1/5
d) |-3| * |4 - 7| * |12 - 5| : (-9)=3*3*7:(-9)=63:(-9)= -7