(154-87)×观六介手督入帮云场(49+16)简便算法怎么算?

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(154-87)×观六介手督入帮云场(49+16)简便算法怎么算?
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简便计算：
(1来自54-87)(49+16)
=67*65
=(66+1)(66-1)
=66^2-1
=4356-1
=4355