问题
填空题
计算:
|
答案
•b+1 a
-a+1 b
•b-1 a
=a-1 b
-(b+1)(a+1) ab
=(b-1)(a-1) ab
=ab+a+b+1-(ab-b-a+1) ab
.2(a+b) ab
计算:
|
•b+1 a
-a+1 b
•b-1 a
=a-1 b
-(b+1)(a+1) ab
=(b-1)(a-1) ab
=ab+a+b+1-(ab-b-a+1) ab
.2(a+b) ab