(本小题每题6分,共12分)解方程:(1) 3x +5 = 4x + 1 (2) -1=
-10÷5×6
-2+5
计算: (1). (2)5.6+(-0.9)+4.4+(-8.1) (3) (4). (5) (6)
(本题6分)+()-1-sin45°+|-2013|
(本题6分)计算: