0.279*355+0.645*279快
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0.279*355+0.645*279快0.279*355+0.645*279快0.279*355+0.645*279快0.279*355+0.645*279=279*0.355+0.645*279=
0.279*355+0.645*279快
0.279*355+0.645*279
快
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