3.x<>10【<>为不等号】
4.原式=(x-y)/x(x-y)-x/x(x-y)
=(x-y-x)/x(x-y)
=y/(x^2-xy)
5.原式=2(a+1)/(a+1)^2 除以 2/(a+1)
=2/(a+1) / 2/(a+1)
=1
6.原式=((x+1-x+1)/(x^2-1)*(x-1)
=2/(x^2-1)*(x-1)
=2/(x+1)
=2/3
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