1/5=12:(60)=(5)/25=(20)%=(2)折=(0.2)。(1)把百分数化成整数或小数。300%=3105%=1.0563%=0.630.8%=0.00895%=0.95(2)把百分数化成百分数。17%=17/10024%=24/100120%=120/10062.5%=62.5/10085%=85/100