题目

先化简下列分式，再选一个你认为合适的数字代入并求代数式的值． 答案：【考点】分式的化简求值． 【分析】先根据分式混合运算的法则把原式进行化简，再选取合适的x的值代入进行计算即可． 【解答】解：原式=[﹣]• =• =• =， 当x=1时，原式==．下列每句话中都有一处错误，请找出并改正。1. September 10th is Teacher's Day.                                                                 A           B       C        D2. They are going to buy a bicycle at Sunday.                                                         A          B         C      D 3. The little boy work hard at school.                                                               A            B      C   D 4. How old is your friend? He's twelve year old.                                             A                             B          C         D 5. Rose has supper and her family.                                                             A           B        C        D