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17.8+0.42-4.81
=18.22-4.81
=13.41
15.4-0.82+1.67
=14.58+1.67
=16.25
8.65-(3.56+1.8)
=毕答8.65-5.36
=3.29
6.5+(12.08+4.36)闹数穗
=液卜6.5+16.44
=22.94
=18.22-4.81
=13.41
15.4-0.82+1.67
=14.58+1.67
=16.25
8.65-(3.56+1.8)
=毕答8.65-5.36
=3.29
6.5+(12.08+4.36)闹数穗
=液卜6.5+16.44
=22.94
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