（1）0.99×99+0.99 =0.99×（99+1）=0.99×100=99（2）53.28×97+53.28×2+53.28=53.28×（97+2+1）=53.28×100=5328（3）1.25×0.96×0.8=0.96×（1.25×0.8）=0.96×1=0.96
