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4*5*(-20)*6
20*(-20)*6
-400*6
-2400
b)
(-3)*(-4)*(-5)*(-6)*(-2)
12*30*(-2)
360*(-2)
-720
c)
8*(-6)*(-4)*5*(-6)*3
(-48)*(-4)*5*(-18)
(-48)*(-20)*(-18)
(-48)*360
-17280