求计算或化简2道题求计算或化简(x+1-3/(x-1))÷(x+2)/(2x-2)a+b+2b^2/a-b

(x+1-3/(x-1))÷(x+2)/(2x-2)
=((x*x-4)/(x-1))/((x+2)/(2(x-1)))
=2(x-2)
第二题题目完整吗?
a+b+2b^2/a-b
=a+b-b+2b^2/a
=a+2b^2/a