the triangle has .... sides, 3, 4, 9, 11, 13, ....., 12, 15, 10 - 10 = , 20, 0, which number is the least, 15, 12, + ten =......., 16, 6, 6,....,10, 12, 14?, 8, 11, , 2, 1, 10, 8, 6, ......, ......., 4, 2, 5, 6, ........ is 3 less than 12, 15, 9, there are 9 children in the class, 5 children walk out of the class. How many children are left in the class?, 9 - 5 = 4, 9 + 5 = 14.

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