(每小题3分,共6分)计算: (l)-4×(-3)÷(-2); (2)- -[+(1-)÷(-2)].
计算:.
(本小题6分)计算: (1) (2)
计算:2cos30°+sin45°-tan60°.
计算:(每小题8分,共16分)(1) ×÷(2) +6-2x