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I will add 50 points if I understand it! ! A math problem in Xiaoshengchu! Let's have a look!
AD is x, and the height of parallelogram is h:

So the area of triangle ADF is:

1/2*x？ *? 1/2h？ =5?

xh=20

So the area of the parallelogram is 20.

So the area of triangle AEF is 20-3-4-5=8?

I hope I can help you. . . If you still don't understand this question, you can contact me.

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