解答

✨ 最佳解答 ✨

令AE = ED = x,BF = 2y,FC = y
2x = 3y,x : y = 3 : 2

△DEH~△BFH,DH : HB = DE : BF = 3 : 4
△ADG~△BFG,DG : GB = AD : BF = 6 : 4 = 3 : 2

HB = 105*(4/7) = 60,GB = 105*(2/5) = 42
GH = HB - GB = 18

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