已知x^2-2/x^3-3x^2+2x=A/x+B/x-1+C/x-2,试确定整数A,B,C的值.要具体过程,

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/26 19:59:08
已知x^2-2/x^3-3x^2+2x=A/x+B/x-1+C/x-2,试确定整数A,B,C的值.要具体过程,
xRJPIwkJX+l{@4BhZhdXjeV4@KnStä>5=s~gQ Z8%(LT+i2%Zﻤ[*Vhص#9Cr7Ǘδh?/ylBۊ|e3ļoP@%Eg/I U1+`ڝ2:7dH.*L_ZP~ckxi̥cJ /x fd75-E!!{@8! 2yz"HtO֍9nQL 2([SAz!v޺m3S;g+Raә֭N+?J/|K 2 & ~6-BcIE楨ƄJ/纰~j_EMp*H8Buch!

已知x^2-2/x^3-3x^2+2x=A/x+B/x-1+C/x-2,试确定整数A,B,C的值.要具体过程,
已知x^2-2/x^3-3x^2+2x=A/x+B/x-1+C/x-2,试确定整数A,B,C的值.要具体过程,

已知x^2-2/x^3-3x^2+2x=A/x+B/x-1+C/x-2,试确定整数A,B,C的值.要具体过程,
x³-3x²+2x=x(x²-3x+2)=x(x-1)(x-2)
(x²-2)/(x³-3x²+2x)=A/x+B/(x-1)+C/(x-2)
等式两边同乘x(x-1)(x-2)得:
x²-2=A(x-1)(x-2)+Bx(x-2)+Cx(x-1)
x²-2=A(x²-3x+2)+Bx²-2Bx+Cx²-Cx
x²-2=(A+B+C)x²-(3A+2B+C)x+2A
则:A+B+C=1
3A+2B+C=0
2A=-2
解得:A=-1,B=1,C=1

祝你开心!希望能帮到你,如果不懂,请追问,祝学习进步!O(∩_∩)O

A/x +B/(x-1)+C(x-2)
=[A(x-1)(x-2)+Bx(x-2)+Cx(x-1)]/[x(x-1)(x-2)]
=[(A+B+C)x²-(2B+C-3A)x+2A]/(x³-3x²+2x)
=(x²-2)/(x³-3x²+2x)
A+B+C=1
2B+C-3A=0
2A=-2
解得
A=-1 B=-5 C=7