问题:
计算:
(1)(2a+3b+1)(1-2a-3b)+(2a-3b) 2
(2)
x
x-1
÷
x2-x
x2-1
+
1
1-x
.
计算:
(1)(2a+3b+1)(1-2a-3b)+(2a-3b) 2
(2)
÷
+
.
(1)(2a+3b+1)(1-2a-3b)+(2a-3b) 2
(2)
x |
x-1 |
x2-x |
x2-1 |
1 |
1-x |
参考答案: