原式=(x²/4+3xy+9y²-y²/4-xy-x²+9x²-3xy+y²/4-9y²+x²/4)÷(x/2)
=(17x²/2-xy)÷(x/2)
=17x²/2÷(x/2)-xy÷(x/2)
=17x-2y
好难的说：[(x/2+3y)^2-(y/2+x)^2+(3x-y/2)^2-(x/2+3y)(3y-x/2)]÷x/2
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