运用乘法公式进行计算.(m-2n+p)(m+2n-p)和(m-2n+p)(m+2n+p).先化简,再求值.(a+b)(a-b)+(a+b)²-2a².

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运用乘法公式进行计算.(m-2n+p)(m+2n-p)和(m-2n+p)(m+2n+p).先化简,再求值.(a+b)(a-b)+(a+b)²-2a².

运用乘法公式进行计算.(m-2n+p)(m+2n-p)和(m-2n+p)(m+2n+p).先化简,再求值.(a+b)(a-b)+(a+b)²-2a².
运用乘法公式进行计算.(m-2n+p)(m+2n-p)
和(m-2n+p)(m+2n+p).
先化简,再求值.(a+b)(a-b)+(a+b)²-2a².

运用乘法公式进行计算.(m-2n+p)(m+2n-p)和(m-2n+p)(m+2n+p).先化简,再求值.(a+b)(a-b)+(a+b)²-2a².
(m-2n+p)(m+2n-p)=[m-(2n-p)][m+(2n-p)]=m^2-(2n-p)^2=m^2-4n^2+4np-p^2
(m-2n+p)(m+2n+p)=[(m+p)-2n][(m+p)+2n]=m^2+2mp+p^2-4n^2
(a+b)(a-b)+(a+b)²-2a²=a^2-b^2+a^2+2ab+b^2-2a^2=2ab

2008乘2012-2007乘2013=(2010-2)乘(2010+2)-(2010-3)乘(2010+3)
=2010^2-4-(2010^2-9)=5