( ) +5 = 7, 17+ 6=, 2 + ( ) = 8, 5 - 4 =, 6 + ( ) = 10, 9 - 9 =, 3 + ( ) = 12, 1 + 19 =, 6 + ( ) = 11, 3 + 19 =, ( ) + 8 = 13, 3 和 5 的之间有什么数目 ？, 8 - 8 =, 7和10 的之间有什么数目 ？, 10 - 10 =, 10 之前是什么数目 ？, 6 + 9 =, 9 - 6 =, 8 + 10 =, 13 之后会到什么数目 ？, 5 + 7 =, 11 + 6 =, 10 - 0 =, 17 之后的数目是什么数目 ？, 7 +9 =, 20 之前是什么数目 ？, 8 - 6 =, 14 + 2 =, 3+16=, 11+7 =

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