A:worry
B:worried
C:worrying
有理数的乘法
①(-1.5)×(-0.5)=____;
②(-0.1)×(+100)=____;
③ 313×-115 =____;
④ 0×-910=____.
A. B.
C. D.
①____ ②____ ③____ ④____