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平方根相乘可能比你想象中容易得多,你已经熟悉乘法和变量问题了,也可以顺畅运用FOIL(一种化简两个二项式相乘的)方法。按照下列步骤,将根数相乘吧。
步骤
小提示
- 按照一般的符号法则来判断新系数是正还是负。正系数乘以负的会得到负的,两个正的或负的相乘得到正的。
- 所有根号下的数都是正数的,所以不用考虑上面的符号法则。
- 一定要记得一些完全平方数例子,这样计算会快!
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