(1)解方程: 2 x = 3 x + 1
(2)解不等式组: 2 x > 0 x + 1 2 > 2 x - 1 3 .
(2)先化简,再求值: – ,其中x = –3
(1)计算:3(–π)0– + (–1)2011
计算:(1)2×(-5)+23-3÷.