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Beijing normal university printing plate sixth grade second volume knowledge and ability training mathematics answer.
gymnasium

Line 1 and (1); Face; body

(2) the bottom surface; Round; High; One side, one side

(3) circle; Fan shape; Vertex; centre of a circle

(4) countless; Equality; one

(5) cylinder; High; Cone; high

Intelligent house

leave out

Activity angle

4. Length: 6×6 = 36m;; Width: 4× 6 = 24 (m); Height:12× 2 = 24m.

5.( 10- 1) × 1.5+20× 10 = 9× 1.5+200 = 13.5+200 = 2 13.5 (.