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一、判断题：下列各题的恒等变形是不是因式分解？（每小题3分，共15分）1．5m－5n－7＝5（m＋n）－7；（）2．m2-1＝（m2＋1）（m2-1）；（）＿互9‘，I33．手一x十千x‘。（千一；x）‘；（）”q“4””32“”粤．3X（X叫卜y）（J－y）一6X—3X（rZ－／－2）；（）－。‘，。
I. Judging Question: Is the isomorphic deformation of the following questions not due to factorization? (3 points for each question, a total of 15 points) 1.5m-5n-7 = 5 (m + n) -7; () 2. M2-1=(m2+1)(m2-1);()_ mutual 9’,I33. One x thousand x ‘ hand. (One Thousand; x) ‘;()” q “4”” 32”” Yue. 3X (X is called Bu y) (J-y) is a 6X-3X (rZ-/-2); ()-. ‘,.