1、x+1=1 或x+1=2
∴x=0或x=1
2、原式=2a/(a+2)(a-2) -1/(a-2)
=2a/(a+2)(a-2)-(a+2)/(a+2)(a-2)
=(2a-a-2)/(a+2)(a-2)
=(a-2)/(a+2)(a-2)
=1/(a+2)
3、原式=a²b³ ×a的(-2)次方b的(-4)次方=b的(-1)次方=1/b
4、原式=x(x+9)/x(x+3) +(x+3)(x-3)/(x+3)²
=(x+9)/(x+3)+(x-3)/(x+3)
=(x+9+x-3)/(x+3)
=2
5、原式=1/(a+b)(a-b)÷(a-b+a+b)/(a+b)(a-b)
=1÷2a
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