求(+5)+(-4.3)+(+8)+(-5.8)+(-9)+(+2.7)
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(+5)+(-4.3)+(+8)+(-5.8)+(-9)+(+2.7)
=5-4.3+8-5.8-9+2.7
=1.7+8-5.8-9+2.7
=9.7-5.8-9+2.7
=3.9-9+2.7
=-5.1+2.7
=-2.4
=5-4.3+8-5.8-9+2.7
=1.7+8-5.8-9+2.7
=9.7-5.8-9+2.7
=3.9-9+2.7
=-5.1+2.7
=-2.4
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