15.75÷0.21=
157.5÷21=
0.75×2.1=
26×a+b×=(+)×a
1.5×0.81.5 37.5×1037.5÷0.1 3.6×4.9820
0.876÷0.781 1÷30.34 a÷0.9089a÷1.01(a>0)
(元)