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- Zhanjiang Second Model Mathematics 20 17
Zhanjiang Second Model Mathematics 20 17
Solution: (1) As shown in the figure, in the isosceles trapezoid CDEF, if DH is high, then EH=AB=x and DH=EH? tan∠FED=34x
∴s=xy+ 12(x+3x)×34x=xy+32x2=6,
∴y=6x? 32x
∫x > 0,y>0
∴6x? 32x>0,∴0
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