-4.2-[(-0.2)-(-7.5+0.4)]+(-3.8)

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-4.2-[(-0.2)-(-7.5+0.4)]+(-3.8)
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-4.2-[(-0.2)-(-7.5+0.4)]+(-3.8)
-4.2-[(-0.2)-(-7.5+0.4)]+(-3.8)

-4.2-[(-0.2)-(-7.5+0.4)]+(-3.8)
原式
=-4.2+0.2+(-7.5+0.4)-3.8
=0.6-7.5-8
=-7.4-7.5
=-14.9

-4.2-[(-0.2)-(-7.5+0.4)]+(-3.8)
=-4.2-[(-0.2)+7.5-0.4]+(-3.8)
=-4.2-[7.5-0.6]+(-3.8)
=-4.2-6.9-3.8
=-(4.2+3.8+6.9)
=-(8+6.9)
=-14.9

=-4.2+0.2-7.1-3.8
=-14.9