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- Simplified evaluation questions of junior high school mathematics;
Simplified evaluation questions of junior high school mathematics;
Derived from the fact that A and B are two real numbers of the equation x 2+2x-5 = 0:
AB=-5，A+B=-2
A^2+2AB+2A)(B^2+2AB+2B)
=AB(A+2B+2)(B+2A+2)
=-5(-2+B+2)(-2+A+2)
=-5AB
=25
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