0.279355+0.645279快

来源：学生作业学帮网编辑：学帮网时间：2024/06/01 16:57:20

0.279*355+0.645*279
快

0.279*355+0.645*279
=279*0.355+0.645*279
=279*（0.355+0.645）
=279*1
=279

0.279*355+0.645*279快快快快快快快快快快快快快快快快快快.