-3-[-5+(1-0.2÷3/5)÷(-2)]
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-3-[-5+(1-0.2÷3/5)÷(-2)]
=-3-[-5+(1-1/3)÷(-2)]
=-3-[-5+2/3÷(-2)]
=-3-[-5-1/3]
=-3+16/3
=7/3
=-3-[-5+(1-1/3)÷(-2)]
=-3-[-5+2/3÷(-2)]
=-3-[-5-1/3]
=-3+16/3
=7/3
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原式=-3-[-5+(1-1/5×5/3)×(-1/2)]
=-3-[-5+(1-1/3)×(-1/2)]
=-3-(-5-2/3×1/2)
=-3+5+2/3×1/2
=2+1/3
=2又1/3=7/3
=-3-[-5+(1-1/3)×(-1/2)]
=-3-(-5-2/3×1/2)
=-3+5+2/3×1/2
=2+1/3
=2又1/3=7/3
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