9.99*7.78+3.33+6.66这道题的简算怎么算?
2个回答
9.99*7.78+3.33+6.66
=9.99*7.78+9.99
=9.99*(7.78+1)
=9.99*8.78
=(10-0.01)*8.78
=87.8-0.0878=87.7122
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