(每小题3分,共12分)(1) (2) 8-8÷(-2)(3) (4)
计算:
计算; (1) (2)(-)2007×1.52008×(-1)2008
(1)解方程:x2+3x-2=0;(2)解不等式组:
计算: (1)-2-(-)0+2sin60°-|-3|; (2)(x+1)2-(x+2)(x-2)
计算:.