938+234-138+166 巧算

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938+234-138+166巧算938+234-138+166巧算938+234-138+166巧算938+234-138+166=(938-138)+(234+166)=800+400=12009

938+234-138+166 巧算
938+234-138+166 巧算

938+234-138+166 巧算
938+234-138+166
=(938-138)+(234+166)
=800+400
=1200

938+234-138+166
=938-138+166+234
=800+400
=1200

=(938-138)+(234+166)
=800+400
=1200