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(a+1)(b-1) 十字相乘 a 1 b -1 前面的都錯了,因式分解不能有括弧外的低級(加减)運算的.
ab+a+b+1=a(b+1)+(b+1)=(a+1)(b+1).故答案為:(a+1)(b+1).
=(a-1)(b+1)
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