(1) (2)(3) (4)(5)
计算或化简:(本题每小题4分,共8分) (1) (2)
化简(每题3分,共计9分)(1)(2);(3)先化简,再求值:,其中.
计算 :(每题3分,共计12分) (1); (2) (3) (4)
(本题共12分,每小题3分)计算: (1)-20-(-14)+(-18)-13 (2)4×(-3)2-5×(-2)3-6; (3) (4)
计算(每题3分,共12分) (1) (2) (3) (4)