用计算器计算小数加减法,开机/清除,关机,清除/归零,0.80+24.00+15.40+44.70+6.00= （元）,90.9,试一试,如果李芸付出100元，应找回多少元？,（用计算器计算）,100 - 90.9 = 9.1（元）,=17.38,=116.41,=6.135,=4.138,=12.135,=49.152,1103.50,971.00,945.20,931.95,2989.95,2906.95,2942.95,2937.45,2900.05,2532.05,2094.00,765.45,小华在计算一道小数减数时，把被减数十分位上的8看成了3，把减数百分位上的1看成了7。你能算出错误的答案与正确的答案相差多少吗？,
