土地需求
参考答案:
人类为了生存和发展利用土地进行各种生产和消费活动的需求。
计算(用两种方法求解,并比较哪种方法简单):
(1)(- 3a-2b)2;
(2)(a-2b)2-(a+2b)2;
(3)(x+2y)2(x-2y)2。
He has ______ daughter______ Mary. [ ]
A. a eight years old, name
B. an eight-years-old, named
C. an eight-year-old, named
D. a eight-year-old, naming