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(x+mx-8)(x-3x+n)=x^4-3x^3+nx^2+mx^3-3mx^2+nmx-8x^2+24x-8n=x^4+(-3+m)x^3+(n-3m-8)x^2+(mn-24)x-8n因為展開後無x和x項,所以-3+m=0 n-3m-8=0解得m=3 n=17.請點擊“採納為答案”
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