16.17.18题,

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16.17.18题,

16.17.18题,
16.17.18题,
 

16.17.18题,
15.-1
16.20,21,22
17.40
18.(1)=-(17+37)+59
=-54+59
=59-54
=5
(2)=-8-1/2×(5-9)
=-8-1/2×(-4)
=-8+2
=-6

18（1）59-54=5

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