3a²+6ab+3b²+(-2a²-8ab-2b²)=a²-2ab+b²
-5a²-4ab-2b²+(6a²-2ab+3b²)=a²-2ab+b²
-5ab-3b²+(a²+3ab+4b²)=a²-2ab+b²
写出两个整式,使它们的和为a2-2ab+b2.请你写出三个正确答案
3a²+6ab+3b²+(-2a²-8ab-2b²)=a²-2ab+b²
-5a²-4ab-2b²+(6a²-2ab+3b²)=a²-2ab+b²
-5ab-3b²+(a²+3ab+4b²)=a²-2ab+b²