练习二十一答案；1题150.04 0.03100/12题1.35吨大于1.23吨大于0.75吨大于0.35吨大于35千克3题最大数是42.1最小数1.2442.1+1.24=43.34 42.1-1.24=40.86 4题9.52.54 5120...