题目

若是方程mx﹣2m+2＝0的根，则x﹣m的值为（ ）A. 0 B. 1 C. ﹣1 D. 2 答案：【答案】C【解析】把x值代入所给的方程即可求得m的值，进而求得x的值，那么就可求得所给代数式的值．解：把x＝1﹣代入方程得：m（1﹣）﹣2m+2＝0，解得：m＝1，∴x＝0，∴x﹣m＝0﹣1＝﹣1，故选C． All my books are English books except two．All my books are maths books except two．All my books are Chinese books except two．How many books do I have? _____________________