We lost the soccer game, __________ everyone of us played very well.
A:because
B:though
C:or
D:so
函数y=lgx+2x-1的定义域是____
米,哪块铁皮的面积最接近1平方米?( )
写出下列字母的左邻右舍,包含大小写形式。
____ Ss ____
(1)计算:-22+212-8cos30°--3;
(2)先化简,再求值:(a﹣2)(a+2)﹣a(a﹣2),其中a=﹣1.