第113页

信息发布者：
  3.79×0.38+1.59×6.21+3.79×1.21
=3.79×(0.38+1.21)+1.59×6.21
=1.59×(3.79+6.21)
=15.9
=5.78×8.8+6.15×4.22-5.78×2.65
=5.78×(8.8-2.65)+6.15×4.22
=5.78×6.15+6.15×4.22
=6.15×(5.78+4.22)
=61.5
0.4321
0.04321
用m代替0.25+0.258,用n代替0.25+0.258+0.2589
. (1+0.25+0.258)×(0.25+0.258+0.2589)-(0.25+0.258)×(1+0.25+0.258+0.2589)
=(1+m)×n-m×(1+n)
=n-m
=0.2589
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