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  • ZeroProduct 日期:2011-09-20 10:13:00 来源:作文地带 好评:优秀英语作文

    作文地带导读:When the product of any number of terms is zero, you know that at least one of the terms is equal to zero. For example, if xy = 0, you know that either:x = 0, and y ≠ 0 y = 0, and x ≠ 0 x = y = 0.  This is useful in a situ...

    either equation Product Zero equal

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