938+234-138+166 巧算
问题描述:
938+234-138+166 巧算
答
=(938-138)+(234+166)
=800+400
=1200
答
938+234-138+166
=938-138+166+234
=800+400
=1200
答
938+234-138+166
=(938-138)+(234+166)
=800+400
=1200