题目

—Do I have to bring my camera tomorrow afternoon?—I think so. We _______ the Botanical Garden then. A . will be visiting B . are visiting C . have visited D . visit 答案：A已知一元二次方程x2-2x+m=0．（1）若方程有两个实数根，求m的范围；（2）若方程的两个实数根为x1，x2，且x1+3x2=3，求m的值．