8x^5-2x^3+1/3x^2-4=8x^5-(2x^3-1/3x^2)-4=7x^5-( -x^5+2x^3-1/3x^2+1)-3
填空 8x^5-2x^3+1/3x^2-4=8x^5-( )-4=7x^5-( )-3
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