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1 + 2 = 2 + ( ) (a)
3 + 7 = 7 + 3,結果都是_。 (a)
哪一題算式的結果與6 + 8相同?
8 + 6
6 + 9
9 + 6
9 + 8
哪一題算式的結果與4 + 5相同?
9 + 5
5 + 4
9 + 9
5 + 9
問號的方格內應寫上哪一個數?
9
8
7
6
7 + 7 = 14,14 - ( ) = 7 (a)
11 - 6 = 5,6 + ( ) = 11 (a)
方格內應填上哪一個數? (a)
筆15支,其中鉛筆有9支,其餘的都是原子筆,原子筆有幾支?
15 - 6 = 9
15 + 9 = 24
9 - 15 = 6
15 - 9 = 6
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