一、填空题（每小题5分，共30分）二、单项选择题（每小题5分，共30分）1．下列各式从立到右的变形，为因式分解的是（）（A（。－y）（。－b）－。。－bX－。y＋by；（B）4－X‘－y’＋Zxy＝（2＋。－／）（2－x＋y）；（C）aZ＋l＝。（。＋1）；（D）。’－。－30＝（x＋6） First, fill in the blank (5 points for each question, a total of 30 points) Second, single-choice questions (5 points for each question, a total of 30 points) 1. The variants from the upright to the right of the following formulae are factored ()(A(.-y)(.-b)-..-bX-.y+by; (B)4-X’-y’+Zxy. =(2+.-/)(2-x+y);(C)aZ+l=.(.+1);(D).’-.-30=(x+6)