(2m+4n)的平方乘以(m-2n)的平方等于多少 简便的

问题描述:

(2m+4n)的平方乘以(m-2n)的平方等于多少 简便的

(2m+4n)^2(m-2n)^2
=[2(m+2n)]^2(m-2n)^2
=4(m+2n)^2(m-2n)^2
=4[m^2-(2n)^2]^2
=4(m^2-4n^2)^2
=4(m^4-8m^2n^2+16n^4)
=4m^4-32m^2n^2+64n^4

(2m+4n)2*(m-2n)2
=【2(m+2n)】2*(m-2n)2
=4(m+2n)2*(m-2n)2
=4[(m+2n)*(m-2n)]2
=4(m2-4n2)2
=4(m4-8m2n2+16n4)
(上面m4、n4指m的四次方、n的四次方)

(2m+4n)²(m-2n)²= 4[(m+2n)(m-2n)]²= 4(m² - 4n²)²= 4(m^4 - 8m²n² + 16n^4)= 4m^4 - 32m²n² + 64n^4 (m^4 就是m的四次方)