(1)(a-b)²+b(2a+b)
=a²+b²-2ab+2ab+b²
=a²+2b²;
(2)x²/(x-z)+1/(1-x)
=x²/(x-1)-1/(x-1)
=(x²-1)/(x-1)
=x+1;
如果本题有什么不明白可以追问,