将抛物线向左平移4个单位后，再向下平移2个单位，则所得到的抛物线的解析式为（　　　）.

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问题将抛物线向左平移4个单位后，再向下平移2个单位，则所得到的抛物线的解析式为（　　　）.

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答案 B

解析

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