解:底面半径是15.7÷3.14÷2=2.5(米)3.14×2.5²×1.7×1/3×210=3.14×6.25×1.7×70=19.625×1.7×70=2335.375(千克)答:这堆饲料大约重2335.375千克。祝你开心