Explicación paso a paso:
a)(-6).(-12)=-18 + . + = +
b)(-21).(-3)=-24 - . - = +
c)(-30).(-5)=+35 - .+ = -
d)(+15).(45)=+60 + . - = -
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Explicación paso a paso:
a)(-6).(-12)=-18 + . + = +
b)(-21).(-3)=-24 - . - = +
c)(-30).(-5)=+35 - .+ = -
d)(+15).(45)=+60 + . - = -