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主要内容

有理表达式的乘除法

问题

将下列有理式相除并化简。
start fraction, 3, x, minus, 6, divided by, x, squared, plus, 21, x, plus, 54, end fraction, divided by, start fraction, 40, x, squared, divided by, x, squared, plus, 6, x, plus, 9, end fraction, equals
x 为何值时表达式未定义?
选择所有正确的答案:
不会做了?
不会做了?