简便运算7.5*83-2.5*9
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简便运算7.5*83-2.5*9
简便运算7.5*83-2.5*9
简便运算7.5*83-2.5*9
7.5*83-2.5*9
=7.5*83-7.5*3
=7.5*(83-3)
=7.5*80
=600
7.5*83-2.5*9
=2.5*3*83-2.5*9
=2.5*(3*83-9)
=2.5*(249-9)
=2.5*240
=600