计算:(共24分每题4分)(1) (2)[-2 2+(-2)3 ]-(-2)×(-3) (3)()() (4)(5)—14+〔1-(1-0.5×2)〕÷(6)[(-3)2-22-(-5)2]××(-2)4
(1)(-3)2-+(-1)0+2cos30º; (2)化简:.
计算:
解方程:(1)(2)
计算:(1) (2)