99.9x7.78+33.3x6.66的巧算
1个回答
99.9x7.78+33.3x6.66
=99.9x7.78+33.3x3x2.22
=99.9x7.78+99.9x2.22
=99.9x(7.78+2.22)
=99.9x10
=999
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