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根據題意可得:所填的式子為(m+n)-(2m-p),化簡為(m+n)-(2m-p)=m+n-2m+p=-m+n+p.
原式=(30+2/3)×(30-2/3) =30²;-(2/3)²; =900-4/9 =899又5/9
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