【急】四道分式计算题【悬赏20】速度追加101.1^2-1/a^2+2a+1÷a^2-a/a+12.x+2/x-3*a^2-6x+9/x^2-43.a-2/a+3÷a^2-4/a^2+6a+94.(xy-x^2)*xy/x-y

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【急】四道分式计算题【悬赏20】速度追加101.1^2-1/a^2+2a+1÷a^2-a/a+12.x+2/x-3*a^2-6x+9/x^2-43.a-2/a+3÷a^2-4/a^2+6a+94.(xy-x^2)*xy/x-y
【急】四道分式计算题【悬赏20】速度追加10
1.1^2-1/a^2+2a+1÷a^2-a/a+1
2.x+2/x-3*a^2-6x+9/x^2-4
3.a-2/a+3÷a^2-4/a^2+6a+9
4.(xy-x^2)*xy/x-y

【急】四道分式计算题【悬赏20】速度追加101.1^2-1/a^2+2a+1÷a^2-a/a+12.x+2/x-3*a^2-6x+9/x^2-43.a-2/a+3÷a^2-4/a^2+6a+94.(xy-x^2)*xy/x-y
(1)a^2-1/a^2+2a+1÷a^2-a/a+1
=(a+1)(a-1)/(a+1)^2*(a+1)/a(a-1)
=a-1/a
(2)x+2/x-3*x^2-6x+9/x^2-4
=x+2/x-3*(x-3)^2/(x+2)(x-2)
=x-3/x-2
(3)a-2/a+3÷a^2-4/a^2+6a+9
=a-2/a+3÷(a+2)(a-2)/(a+3)^2
=a-2/a+3*(a+3)^2/(a+2)(a-2)
=a+3/a+2
(4)(xy-x^2)*xy/x-y
=x(y-x)*xy/x-y
=-x^2y