巧算:2.43*14+1.4*85.7-14

问题描述:

巧算:2.43*14+1.4*85.7-14

2.43*14+1.4*85.7-14
=2.43*14+14*8.57-14
=14*(2.43+8.57-1)
=14*10
=140

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