18*45*(1/6+1/5)简便运算快!

问题描述:

18*45*(1/6+1/5)简便运算快!

18*45*(1/6+1/5)
=18*45*1/6+18*45*1/5
=3*45+18*9
=3*(45+54)
=3*100-3
=300-3
=297
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