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(-0.8)+(-1.2)+(-0.6)+(-2.4
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(-0.8)+(-1.2)+(-0.6)+(-2.4
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答案和解析
(-0.8)+(-1.2)+(-0.6)+(-2.4 )
=[(-0.8)+(-1.2)]+[(-0.6)+(-2.4)]
=(-2)+(-3)
=-5
=[(-0.8)+(-1.2)]+[(-0.6)+(-2.4)]
=(-2)+(-3)
=-5
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