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二年级奥数专题-等量代换练习精品文档三年级奥数训练题1、用,代表三个数,有: + + = 15 , + + =21, + + = 12 , + + =( ) x = ( ) x =( ) x = ( )2 + + + + = 24 + = + + = ( ) = ( )9 + + = 9 + + + + = 23 - = 2=( ) =( ) =( )4、 用,代表三个数,有: + + =9, + + =18, + + = 27 , + + =( )6、 + + + = 20 (4) + + + + = 32 + = 3 + + + + + = 36 + = 9 + + + = 17=( ) =( ) =( ) =( ) =( ) =( )8、 + = 10 + + = 12 + = 6 = ( ) = ( ) = ( )9、 + + + + = 24 + = + + = ( ) = ( )10、 + = 9 + + + + = 23 + - = 2=( ) =( ) =( )11、+=200+=240=( ) =( )13、 +=80+=100=( ) =( )14、 + + + = 20 + = 3 + = 10 =( ) =( ) =( ) 15、 + = 10 + + = 12 + = 6 = ( ) = ( ) = ( )收集于网络,如有侵权请联系管理员删除