A math problem in the first grade of primary school, extended exercise () 1 1, 14, 16 () I don't know how to do it.

As long as the answer is reasonable. Because he only gave three numbers. The last bracket is followed by a period. Two land options. The last bracket is followed by an ellipsis. Select 1 scheme.

(9) 1 1, 14, 16 ( 19) (2 1) ............

One: From left to right, first add 2, then add 3, and then repeat. 9+2 = 1 1, 1 1+3 = 14, 14+2 = 16, 16+3 = 19 .............

Two: (7) 1 1, 14, 16 (17) (17).

The difference between the latter item and the former item is: 4, 3, 2, 1, 0.

The fifth question on page 46 of the second volume of the fourth grade mathematics classroom is refined.

Please help me write a lesson plan and lecture notes of "Logic and Relationship" in my mathematics for the kindergarten teacher class of Nanjing Normal University. thank you

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