解:简便方法如下6.5×0.98-9.8×0.55=6.5×0.98-0.98×5.5=0.98×(6.5-5.5)=0.98×1=0.98
6.5x0.98-9.8x0.55=6.5x0.98-0.98x5.5=0.98x(6.5-5.5)=0.98x1=0.98