198+12-198+12简便计算,
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198+12-198+12简便计算,
198+12-198+12简便计算,
198+12-198+12简便计算,
198+12-198+12
=198-198+12+12
=12+12
=24
198+12-198+12简便计算,
198+12-198+12简便计算,
198+12-198+12简便计算,
198+12-198+12
=198-198+12+12
=12+12
=24