计算: | - 2 | + 9 × ∣ 1 2 - 1 - 4 × 1 2 - ( π - 1 ) 0 .
解不等式组.
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: