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Te resuelvo los 5 primeros
1.- (-2x) (+3y) = ((-2)3)(x*y)= -6xy
2.- (+4ab) (-3a²b) = (4(-3))(ab*a²b) = -12a³b²
3.- (-8ab) (2cd) = ((-8)2)(ab*cd) = -16abcd
4.- (-2ab) (-3bc) (-2cd) = ((-2)(-3)(-2))(ab*bc) = -12ab²c
5.- (0,1a²b³) (2ab⁴) (5a³bc) = (0,1*2*5)(a²b³*ab⁴*a³bc) = a⁶b⁸c