题目

若关于的一元二次方程有一根为0，则的值等于____________. 答案：【答案】2【解析】把代入方程，可得，解得或，又因为，所以m的值等于2.Try to spend your time just on the things you find _____. [     ]A. worth doing them B. worth being doneC. worthy of doing then D. worthy of being done