Question

求不等式2小于等于x平方－2x小于等于8的整数解集

Answer 1

2≤x^2-2x≤8

2+1≤x^2-2x+1≤8+1

3≤(x-1）^2≤8+1

1≤x √3≤(x-1)≤3 √3 +1≤ x ≤3+1

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