计算: ( 3 - 1 ) 0 + | - 1 2 | - ( 1 3 ) - 1 + 3 cos 30 °
计算.
计算:(第(1)题3分,其余各题每题4分,共19分)(1)-3-(-4)+7 (2)(3) (4)(5)
(每小题4分,共8分)计算:(1)(2)
①;
②