0.9999×0.8+0.1111×1.8
=0.1111×9×0.8+0.1111×1.8
=0.1111×7.2+0.1111×1.8
=0.1111×(7.2+1.8)
=0.1111×9
=0.9999
0.9999×0.8+0.1111×1.8 巧算
3个回答
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