(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8(2) 已知x+3/(x-2)^2=A/x-2 + B/(x-2)^2 ,求A和B的值.
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(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8(2) 已知x+3/(x-2)^2=A/x-2 + B/(x-2)^2 ,求A和B的值.
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(2) 已知x+3/(x-2)^2=A/x-2 + B/(x-2)^2 ,求A和B的值.
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8(2) 已知x+3/(x-2)^2=A/x-2 + B/(x-2)^2 ,求A和B的值.
1) (x-3)/(x-2)-(x-5)/(x-4)=(x-7)/(x-6) - (x-9)/(x-8)
化简得 【(x-3)(x-4)-(x-5)/(x-2)】/【(x-2)(x-4)】
=【(x-7)(x-8) - (x-9)(x-6)】/【(x-6)(x-8)】
化简 2/【(x-2)(x-4)】=2/【(x-6)(x-8)】
所以(x-2)(x-4)=(x-6)(x-8) 8x=40
解得:x=5 代入原方程检验
2)(x+3)/(x-2)^2=A/x-2 + B/(x-2)^2
去分母 x+3=Ax-2A + B
X=AX
3=-2A + B
解得 A=1 B=5
(1) x-3/x-2-x-5/x-4=x-7/x-6-x-9/x-8
1-2-1/x-2-1+4-1/x-4=1-1/x-6-1+1/x-8
1-1/x-2+1-1/x-4=1-1/x-6-1-1/x-8
1/x-6-1/x-8=1/x-2-1/x-4
x-8-x+6/(x-6)(x-8)=x-...
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(1) x-3/x-2-x-5/x-4=x-7/x-6-x-9/x-8
1-2-1/x-2-1+4-1/x-4=1-1/x-6-1+1/x-8
1-1/x-2+1-1/x-4=1-1/x-6-1-1/x-8
1/x-6-1/x-8=1/x-2-1/x-4
x-8-x+6/(x-6)(x-8)=x-4-x+2/(x-4)(x-2)
-2/x^2-14x+48=-2/x^2-6x+8
8x=40
x=5
检验。。。。。。。。。
(2) x+3/(x-2)^2=A/x-2 + B/(x-2)^2
=A(x-2)/(x-2)^2+B/(x-2)^2
= Ax-2A+B/(x-2)^2
Ax-2A+B=x+3
x=Ax 3=-2A+B
a=1,b=5
收起
(1) x-3/x-2-x-5/x-4=x-7/x-6-x-9/x-8
1-2-1/x-2-1+4-1/x-4=1-1/x-6-1+1/x-8
1-1/x-2+1-1/x-4=1-1/x-6-1-1/x-8
1/x-6-1/x-8=1/x-2-1/x-4
x-8-x+6/(x-6)(x-8)=x-...
全部展开
(1) x-3/x-2-x-5/x-4=x-7/x-6-x-9/x-8
1-2-1/x-2-1+4-1/x-4=1-1/x-6-1+1/x-8
1-1/x-2+1-1/x-4=1-1/x-6-1-1/x-8
1/x-6-1/x-8=1/x-2-1/x-4
x-8-x+6/(x-6)(x-8)=x-4-x+2/(x-4)(x-2)
-2/x^2-14x+48=-2/x^2-6x+8
8x=40
x=5
(2) x+3/(x-2)^2=A/x-2 + B/(x-2)^2
=A(x-2)/(x-2)^2+B/(x-2)^2
= Ax-2A+B/(x-2)^2
Ax-2A+B=x+3
x=Ax 3=-2A+B
a=1,b=5
收起