(Shanghai Education Edition Senior High School 3) Mathematics: 14.4 "The Nature of Plane and Plane Parallelism" Courseware 1. What is the decision theorem for plane and plane parallelism? Theorem If two intersecting straight lines in a plane are parallel to another plane, the two planes are parallel. 2. The decision theorem that planes are parallel to the plane solves the problem of the condition that the planes are parallel to the plane. Conversely, if the plane is parallel to the plane Under the conditions, what conclusions can be drawn?
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