1/(X+9)+1/(X+16)=1/X 求X的解
来源:百度知道 编辑:UC知道 时间:2024/05/26 20:51:30
连过程一起写出来,以前学的全忘没了,在线等啊
1/(X+9)+1/(X+16)=1/X
通分分母
=>(X+16)X/(X+9)(X+16)X+(X+9)X/(X+9)(X+16)X=(X+9)(X+16)/(X+9)(X+16)X
等号左右消分母
=>(X+16)X+(X+9)X=(X+9)(X+16)
=>XX+16X+XX+9X=XX+25X+144
=>XX=144
=>X=12或-12
方程两边同乘x(x+9)(x+16)
x(x+16)+x(x+9)=(x+9)(x+16)
x^2+16x+x^2+9x=x^2+16x+9x+144
x^2=144
x=±12
代回经检验,x=±12是方程的解
1/(X+9)+1/(X+16)=1/X
通分
(X+9)+(X+16)/(X+9)(X+16)=1/X
(2X+25)/(X+9)(X+16)=1/X
交叉相乘
(2X+25)x=(X+9)(X+16)
2X^2+25x=x^2+16x+9x+144
x^2=144
解得:x=12或x=-12
1/(X+9)+1/(X+16)=1/X
(x+16+x+9)/[(x+16)(x+9)=1/x
x^2=16*9
x1=12,x2=-12
左右都乘以(x+9)(x+16)x
x(x+16)+x(x+9)=(x+9)(X+16)
x^2+16x+x^2+9x=X^2+25x+144
x^2=144
x=12或x=-12
两边同乘x(x+9)(x+16)
变成x(x+16)+x(x+9)=(x+9)(x+16)
化简x2=9*16=144
所以x=±12
好好学习,天天向上吧~
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