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B:-5,-3,-1,1,3,5
C:7,5,3,1,-1,-3
D:25,15,5,-5,-15,-25
A:(+8)*(-17)*(+5)÷(-2)=-680÷2=-340
B:(-4)*(-35)*(-18)÷(-9)÷(+7)=40
C:-8-[21÷(-3)]+[6*(-2)-7]=-20
D:-[-6÷2-4*(-5)]*(-2)-2=-140