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The seventh grade, the second volume, Mathematics Pairing Answers Education Edition.
Page 42, exercise1; ( 1) 1; (2)- 1; (3)5 12; (4)- 125; (5)0.00 1; (6) 1/ 16; (7) 10000; (8)- 100000

You can directly use the calculator to calculate the second question.

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