分解因式：a2-b2+a-b．
a2-b2+a-b，
=（a2-b2）+（a-b），
=（a+b）（a-b）+（a-b），
=（a-b）（a+b+1）．
连一连。
tuán jié 相遇
xiāng yù 尊重
zūn zhòng 团结
Open market purchases:（）
A. inject additional reserves into the banking system and increase the money supply.
B. inject additional reserves into the banking system and decrease the money supply.
C. remove reserves into the banking system and increase the money supply.
