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乘法公式是初一代数的重要内容,也是今后学习数学的基础,应用十分广泛,必须认真学好,并注意以下两点:1.抓住特点,准确证公式,例如完全平方公式(a±b)~2=a~2±2ab+b~2.特点是:a的降幂,b的升幂;系数是1、±2、1.记忆口诀是:首平方、尾平方,两倍首尾在中央.2.注意公式中字母的广泛含义,深刻理解公式,即公式中的字母可以是数字,单项式,也可以是多项式,深刻理解公式,是应用公式的关
Multiplication formula is an important part of the first generation. It is also the basis for learning math in the future. It is widely used and must be carefully studied. The following two points should be taken into consideration: 1. Grasp characteristics and accurate proof formulas such as the complete square formula (a ± b) ~ 2 = a ~ 2 ± 2ab + b ~ 2. Features are: a power of b, the power of b; coefficient is 1, ± 2, 1. Memory formulas are: the first square, the tail square, twice the beginning and end in the center .2 Note that the formula in the wide range of letters, a profound understanding of the formula, the formula in the alphabet can be a number, monomial, it can be a polynomial, a profound understanding of the formula is the application of formula