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Campus geometry junior high school mathematics
(1) let de = l.

AE=AD-DE=n-l

∫Sabdc = Sabc+Sbcd

∴Sabdc=m*(n-l)/2+m*l/2

Sabdc=mn/2

(2) let DE=l

Ae = ad+de = n+l。

∫Sabdc = Sabc-Sbcd

∴Sabdc=m*(n+l)/2-m*l/2

Sabdc=mn/2

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