计算:(1); (2)(-6)×5×;(3)(-4)×7×(-1)×(-0.25);(4)
计算: (1)-4÷4×=_____; (2)-2÷1×(-4)=______.
计算: (1)(-8)×5-40=_____; (2)(-1.2)÷(-)-(-2)=______.