已知4x+1=m(x-2)+n(x-5),求m,n的值
问题描述:
已知4x+1=m(x-2)+n(x-5),求m,n的值
答
4x+1=m(x-2)+n(x-5
=mx-2m+nx-5n
=(m+n)x+(-2m-5n)
∴﹛m+n=4
-2m-5n=1
解得m=7,n=-3