p53. 4. (1)-x-1 (2)5x^-x /5. (1)-6y+6 (2)-2a-1 (3)-ab+2a-3b-1 /6.(1)2x^-3x (2)2a^-6ab/ 7. 3a+b [제곱을^로표시한것입니다^^]
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