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b) 2.(1.(-3)) = 2.(-3) = -6
c) -4.(3.7 - 2.(-3)) = -4.(21+6) = -4.27 = -108
d) 57+24-21 = 81-21 = 60
b)2(-3)=-6
c)-4(21+6) =-108
d) 57+24-21=60
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