25*6-12525的简便运算

25*6-12525的简便运算

25×6-125×25
=25×(6-125)
= -119×25
= -(120-1)×25
= -(30×4-1)×25
= -(30×4×25-1×25)
= -(30×100-25)
= -(3000-25)
= -2975
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