0.279*355+0.645*279快

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0.279*355+0.645*279快
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0.279*355+0.645*279快
0.279*355+0.645*279

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