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The math problem of the first grade ~ ~ is urgently needed! ! ! ! ! If it's good, add points.
In △ACD △ADE,

Angle C= angle DEA AD is commonly used edge angle CAD= angle DAE.

so△ACD?△ADE

So CD=DE

Because C△DEB=DE+DB+EB.

So AE=DE+DB

Plus EB gets 6.

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