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The exercise answer on page 26 of the first volume of the first grade math book.
(7)-5

(8)383.5

(9) 193.5

(10) Monday and Sunday are 8 and 12 respectively.

( 1 1)2,- 1,3

(12) vertical 16, 18, -7 right -3,-12,7

( 13)-4,-6,-8,- 12

(14) The average value is 3. 1.

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