39.17。 97.35=2.48

75.55。 140.72=1.86

90.65。152.86=1.68

2.48/1.86=1.33

1.86/1.68=1.11

1.33+1.11/2=1.22

1,68/1.11=1.51

86.61*1.51=130.78

130.78*[1.51/2+1]=229.52

130-229

达子

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