计算下列各题 (1)-27-(-12); (2); (3)(-12)÷4×(-6)÷2; (4).
计算:
计算题 (每小题3分,共6分)(1) (2)(3)
计算:(1)(2)
.(本题8分)计算:
(本题15分)计算:(1)(2)(3)