Solution: x=2 or x=98 (truncation)
∴ The tunnel width in Liang Xiao design scheme is 2m;
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② Make AI⊥CD stand upright for me,
∫AB∨CD，∠ 1=60，
∴∠ADI=60，
∵ BC ∨ AD,
∴ Quadrilateral ADCB is a parallelogram,
∴BC=AD
X=2 from (1),
∴BC=HE=2=AD
In Rt△ADI, AI=2sin60 = root number 3.
∴ The total area of the four green spaces in Xiaoying's design scheme is 52×48-52×2-48×2+ (root number 3)? =2299 square meters.