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课本上讲了五个乘法公式,一般地说,同学们对公式都能够记住,但运用就不那么自如了。乘法公式有用,但要会用。那么怎样用这些公式呢?
In the textbook, there are five multiplication formulas. In general, students can remember formulas but they are not as comfortable. The multiplication formula is useful, but it will work. So how do you use these formulas?