①（x^2-4/x^2-x-6+x+2/x-3）÷x+1/x-3②x/x-y*y^2/x+y-x^4y/x^4-y^4÷x^/x^2+y^2③当x=－2时,求1/x+1-x+3/x^2-1÷x^2+4x+3/x^2-2x+1的值.可以分批解分批传我会看,

Question

①（ x^2-4/x^2-x-6 + x+2/x-3 ）÷ x+1/x-3
② x/x-y * y^2/x+y - x^4y/x^4-y^4 ÷ x^/x^2+y^2
③ 当x=－2时,求 1/x+1 - x+3/x^2-1 ÷ x^2+4x+3/x^2-2x+1 的值.
可以分批解分批传我会看,

Answer 1

1,(（X-2）（X+2)/(X-3)(X+2)+X+2/X-3 )/X+1/X-3
=2X/X-3/X+1/X-3
=2X/X+1
2,看不懂你写什么,写错了!
3,1//X+1-X+3/(X+1)(X-1)÷(X+1)(X+3)/(X-1)^2
=1/X+1-1/(X+1)^2
=X+1/(X+1)^2-1/(X+1)^2
=x/(x+1)^2
当X=-2
=-2