计算题(((1)(2)(3)每小题4分,第(4)小题5分,共17分)(1)9+(-10)-(-2) (2)(3) (4)
(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÷.