555*125-355*126+355的简便运算

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555*125-355*126+355的简便运算
555*125-355*126+355的简便运算

555*125-355*126+355的简便运算
555*125-355*126+355
=555*125-355*(126-1)
=555*125-355*125
=(555-355)*125
=200*125
=25000

555*125-355*126+355
=555*125-355*(125+1)+355
=555*125-355*125-1*355+355
=(555-355)*125
=200*125
=50000

=555*125-355*126+355*1
=555*125-355*(126-1)
=555*125-355*125
=(555-355)*125
=200*125
=25000