6.17×41.9+6.71×57.1+6.71=(6.71-0.54)x41.9+6.71×57.1+6.71x1=6.71x41.9-0.54x41.9+6.71×57.1+6.71x1=(41.9+57.1+1)x6.71-0.54x41.9=100x6.71-0.54x41.9=671-22.626=648.374