初二数学(多项式除以单项式)语文(短文两篇)
问题描述:
初二数学(多项式除以单项式)语文(短文两篇)
已知m^2+2m-1=0,求m^2+1/(m^2)的值.
已知x^2-y^2=4xy,求(x^4)-(y^4)/(x^2y^2)的值.
”晋陶渊明独爱菊”与其相关的诗句是?
答
已知m^2+2m-1=0,求m^2+1/(m^2)的值.方程二边同除以m:m+2-1/m=0m-1/m=-2m^2+1/m^2=(m-1/m)^2+2=(-2)^2+2=6已知x^2-y^2=4xy,求(x^4)-(y^4)/(x^2y^2)的值.(x^2+y^2)^2=(x^2-y^2)^2+4x^2y^2=16x^2y^2+4x^2y^2=20x^2y^2x^...