求几道初一数学因式分解题目解答1.4x^2-y^2-2y-142.(x^2-xy)/(xy-y^2)-(y^2+xy)/(x^2+xy)+(x^2+y^2)/xy3.(x-2)/x^2/(1-2/x)4.(x-1)/(x^2+3x+2)-6/(x^2-x-2)-(x-10)/(x^2-4)5.100^2-99^2+98^2-97^2+...+2^2-1^2

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