根据1260÷45=28,写出下面各式的得数.630÷45= 45×28= 2520÷90= 2800×450= 420÷15= 56×45= .
15÷ =62.5%= :16== (小数)
= ÷25=40%= :45.
24: == ÷1.2= 折=75%
= ×=36÷ = :13.5.
÷20=0.4= %=2: .