(-2/3)+丨0-5又1/6丨+丨-4又5/6丨+(-9又1/3)

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(-2/3)+丨0-5又1/6丨+丨-4又5/6丨+(-9又1/3)

(-2/3)+丨0-5又1/6丨+丨-4又5/6丨+(-9又1/3)
=(5又1/16+4又5/6)-(2/3+9又1/3)
=10-10
=0