-8的立方根是 .
-0.4×0.2=_______;
(-5)×(3)=_______;
(-3)×(-0.3)=_______;
确定下列各个积的符号,填在空格内: (1)(-7.4)×(-3.2)_______; (2)(-2)×(-2)×2×(-2)________; (3)(-)×(-)×(-)×(-)
计算填空,并说明计算依据: (1)(-3)×5=______(); (2)(-2)×(-6)=_______(); (3)0×(-4)=________();