计算.(每题4分,共24分) (1) (2) (3) (4)(-81) (5) (6)
计算 (1)-9+12-3+8 (2)(-1)+(-)+(+)-(+) (3)(-3)÷2÷(-3)×(-0.75) (4)-16-(1-0.5)××[2-(-3)2]
计算:-12+(π-3.14)0+(-)-2-.
计算: (1); (2).
计算:.
计算 (1) (2)