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Problems in the seventh grade math exercise book 1 of Zhejiang Education Press.
( 1)(2007- 1)(2007+ 1)-2007?

=2007? - 1- 2007?

=- 1

(2) The original formula =2x? +xy-y？ -x？ +y？

=x？ +xy

Substitute x = 3 and y = 4.

Then the original formula =9+ 12=2 1.

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