678.32-99.9怎样简算

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678.32-99.9怎样简算678.32-99.9怎样简算678.32-99.9怎样简算用678.32-100+0.1=578.32+0.1=578.42678.32-(100-0.1)=678.3

678.32-99.9怎样简算
678.32-99.9怎样简算

678.32-99.9怎样简算
用678.32-100+0.1=578.32+0.1=578.42

678.32 - (100 - 0.1)=678.32 - 100 + 0.1 =578.42