(-12)/中括号-(-3)+(-15)中括号=?

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(-12)/中括号-(-3)+(-15)中括号=?
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(-12)/中括号-(-3)+(-15)中括号=?
(-12)/中括号-(-3)+(-15)中括号=?

(-12)/中括号-(-3)+(-15)中括号=?
简单 =(-12)/(3-15)=(-12)/(-12)=1

-12/[-(-3)+(-15)]=-12/(3-15)=-12/-12=1

=-12/(3-15)=1

=1,根本就不需要过程…

-12/[-(-3)+(-15)]
=-12/(3-15)
=-12/-12
=1