1、试一试。
( )个正方形
( )个三角形
( )个正方体
( )____( )=( )
( )_____( )=( )
2、看图列式。
( )____( )=( )
( )_____( )=( )
( )____( )=( )
( )_____( )=( )
( )____( )=( )
( )_____( )=( )
( )____( )=( )
( )_____( )=( )
( )+( )=( )
( )+( )=( )
( )-( )=( )
( )+( )=( )
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