请帮忙出15个初二字母分式混合运算

1.4/(x+2)-x-2
2.(3a-2b-c)/(a-b)(a-c)+(2b-c-a)/(b-c)(b-a)+(2c-b-a)/(c-b)(c-a)
3.[(x+2)/(x^2-2x)-(x-1)/(x^2-4x+4)]/[(x-4)/x]
4.1-[a-1/(1-a)]^2/[(a^2-a+10)/(a^2-2a+1)]
5.1/(x-1)-1/(x+1)-2/(x^2+1)-4/(x^4+1)-8/(x^8+1)
6.1/x(x+1)+1/(x+1)(x+2)+...1/(x+99)(x+100)
7.[(x-1)/(x+1)-(x+1)/(x+2)]/[(x+3)/(x^2+4x+x)]
8.1-[(a-b)/(a+2b)]/[(a^2-b^2)/(a^2+4ab+4b^2)]
9.(5x+y)/(y^2-xy)-3/(y-x)+3x/(xy-y^2)+2/y
10.1/(x^2+3x+2)+1/(x^2+5x+6)+1/(x^2+7x+12)
答案：1.[4-(x+2)^2]/(x+2) 2.1/(a-c) 3.1/(x-2)^2
4.-a^2+a 5.16/(x^16-1) 6.100/x(x+100)
7.-(x+2)/(x+1) 8.-b/(a+b) 9.0 10.3/(x+1)(x+4)
先给这些,输得太累了,