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∵AD‖BC, ∴△ADE∽△CBE, ∴S△ADE/S△CBE=(AE/CE)²;=a/b, ∴AE/CE=根號a/根號b, ∴=S△CDE=S△ABE=根號(ab) ∴S梯形=a+b+2根號(ab)
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