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20以内加减法过关考核训练题大全附答案
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1
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6
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1
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2
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7
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2
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1
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1
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7
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8
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4
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3
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10
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3
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6
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4
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10
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1
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10
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2
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1
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8
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3
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9
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8
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9
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5
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4
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2
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10
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4
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1
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1
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3
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10
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6
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2
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10
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4
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1
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5
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4
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2
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7
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2
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1
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1
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10
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3
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2
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7
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4
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8
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8
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3
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5
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1
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1
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7
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8
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6
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5
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2
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5
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5
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6
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3
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9
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8
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6
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2
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2
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8
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7
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3
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10
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4
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10
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1
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5
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4
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8
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5
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7
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2
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7
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1
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9
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9
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8
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10
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10
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1
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9
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2
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4
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1
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2
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8
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7
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5
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1
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1
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8
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