2187-(1432-3113)简便算法

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2187-(1432-3113)简便算法

2187-(1432-3113)
=2187-1432+3113
=(2187+3113)-1432
=6300-1432
=4868

2187-(1432-3113)
=2187-1432+3113
=2187+3113-1432
=5300-1432
=5300-1300-132
=4000-132
=3868