已知m²+n²=5,x²+y²=401,求多项式(mx=ny)²+(nx-my)²的值
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已知m²+n²=5,x²+y²=401,求多项式(mx=ny)²+(nx-my)²的值
已知m²+n²=5,x²+y²=401,求多项式(mx=ny)²+(nx-my)²的值
已知m²+n²=5,x²+y²=401,求多项式(mx=ny)²+(nx-my)²的值
(mx+ny)²+(nx-my)²
=m²x²+n²y²+n²x²+m²y²
=(m²+n²)(x²+y²)
=5×401
=2005
(mx+ny)²+(nx-my)²
=m²x²+2mnxy+n²y²+n²x²-2mnxy+m²y²
=m²x²+n²y²+n²x²+m²y²
=(m²+n²)x²+(m²+n²)y²
=(m²+n²)(x²+y²)
=5×401
=2005
(mx+ny)²+(nx-my)²
=m²x²+n²y²+2mnxy+n²x²-2mnxy+m²y²
=(m²+n²)x²+(m²+n²)y²
=(m²+n²)(x²+y²)
=5x401
=2005
2005
(mx=ny)²
这是什么