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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)