1.64*81%+1.64*19% 18%*(1/9+1/6)
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1.64*81%+1.64*19% 18%*(1/9+1/6)
1.64*81%+1.64*19% 18%*(1/9+1/6)
1.64*81%+1.64*19% 18%*(1/9+1/6)
1.64*81%+1.64*19%
=1.64*(81%+19%)
=1.64
18%*(1/9+1/6)
=0.18×1/9+0.18×1/6
=0.02+0.03
=0.05