问题 填空题 1a+b,1a2-b2,1a2-ab的最简公分母是______. 答案 1a+b,1a2-b2,1a2-ab的分母是:a+b,a2-b2,a2-ab,∴它的最简公分母是:a(a+b)(a-b).故填:a(a+b)(a-b).