已知(x-1)³分之x²+2=(x-1)分之A+(x-1)²分之B+(x-1)³分之C,求A、B、C的值
问题描述:
已知(x-1)³分之x²+2=(x-1)分之A+(x-1)²分之B+(x-1)³分之C,求A、B、C的值
答
(x-1)³分之x²+2
=(x-1)分之A+(x-1)²分之B+(x-1)³分之C,求A、B、C的值
=(A(x-1)²+B(x-1)+C)/(x-1)³;
∴Ax²+(B-2A)x+A-B+C=x²+2;
A=1;
B-2A=0;
B=2;
A-B+C=2;
C=2+2-1=3;
如果本题有什么不明白可以追问,