Tính:

12 – 5 + 6 = .........	11 – 5 + 9 =……	14 – 5 + 33 = ……
13 – 5 + 6 = ……	11 – 4 + 8 = ……	12 – 5 + 3 = ……
17 – 9 + 3 = ……	18 – 9 + 7 = ……	13 – 5 + 33 = ……

11 – 2

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12 – 3

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13 – 4

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14 – 5

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15 – 6

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16 – 7

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17 – 8

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18 – 9

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11 – 3

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12 – 4

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13 – 5

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14 – 6

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15 – 7

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16 – 8

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17 – 9

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11 – 4

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12 – 5

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13 – 6

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14 – 7

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15 – 8

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16 – 9

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11 – 5

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12 – 6

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13 – 7

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14 – 8

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15 – 9

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11 – 6

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12 – 7

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13 – 8

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14 – 9

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11 – 7

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12 – 8

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13 – 9

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11 – 8

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12 – 9

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11 – 9

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