计算:(1) (2)
(本题4分)计算:
(本题4分)计算:
计算:(每小题4分,共16分.)(1) (2)(a>0,b>0)(3) (4)
计算(本题有3小题,每小题4分,满分12分)(1) (2) (3)
计算:(共24分每题4分)(1) (2)-(-2)×(-3) (3)()() (4)(5)—14+〔1-(1-0.5×2)〕÷(6)××(-2)4