Question

2.83,3.32,2.75,3.17,2.58,2.65,2.78,3.24,3.29,3.41,3.26,2.98,

Answer 1

手算采用方法：取3为比较数,得出-0.17,0.32,-0.25,0.17,-0.42,-0.35,-0.22,0.24,0.29,0.41,0.26,-0.02,0.52.将相近正负数相加得出0.78.在用0.78/13=0.06,加上3得3.06.