[m2+(√2)n2]/[m1+(√2)n1]变形成a+√2b的形式
问题描述:
[m2+(√2)n2]/[m1+(√2)n1]变形成a+√2b的形式
答
[m2+(√2)n2]/[m1+(√2)n1]
=[m2+(√2)n2][m1-(√2)n1]/[m1+(√2)n1][m1-(√2)n1]
=(m1m2-m2n1√2+m1n2√2-2n1n2)/(m1^2-2n1^2)
=(m1m2-2n1n2+(m1n2-m2n1)√2)/(m1^2-2n1^2)
=(m1m2-2n1n2)/(m1^2-2n1^2) +√2(m1n2-m2n1)/(m1^2-2n1^2)
其中a=(m1m2-2n1n2)/(m1^2-2n1^2) b=(m1n2-m2n1)/(m1^2-2n1^2)不知道该怎么问才能解答我的疑惑,这样问试一下,怎么会想到要通分什么的我就想不到