问题
填空题
若抛物线y=x2﹣bx+4的顶点在x轴上,则b的值为( )。
答案
±4
若抛物线y=x2﹣bx+4的顶点在x轴上,则b的值为( )。
±4
Amy's family has fun. They mail a diary(日记簿、日记) to each other. Everyone writes something in it. Amy's brother is open. He tells many things about his life. Amy's sister is Lazy. She doesn't write much. Amy's dad writes stories. Her mom is talkative. She writes a lot. Everyone enjoys the diary. ![]() ![]() ![]() ![]() ![]() ![]()
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