Solving Math Problems in Junior High School Grade Two - Training Enrollment Network

Solving Math Problems in Junior High School Grade Two

Solution: If A is shown as AD⊥BC in D, BD=BC+CD=a+CD.

At △ABD: AD2=AB2-BD2.

In △ACD: AD2=AC2-CD2。

AB2-BD2=AC2-CD2

c2-(a+CD)2=b2-CD2

∴a2+b2-c2=-2a？ laser record

∫a > 0，CD>0

∴a2+b2-c2

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