(-3.14)-(+3.14)
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(-3.14)-(+3.14)
(-3.14)-(+3.14)
(-3.14)-(+3.14)
(-3.14)-(+3.14)
=(-3.14)-3.14
=-6.28
答案是-6.28
(-3.14)-(+3.14)
(-3.14)-(+3.14)
(-3.14)-(+3.14)
(-3.14)-(+3.14)
=(-3.14)-3.14
=-6.28
答案是-6.28