百度作业网x+2/(x-4)(x-3),-2x/(4-x)(3-x) 通分
来源：学生作业帮 编辑：百度作业网作业帮 分类：数学作业 时间：2024/06/06 05:34:55
x+2/(x-4)(x-3),-2x/(4-x)(3-x) 通分
x+2/(x-4)(x-3)=A/(x-4)+B/(x-3)
A+B=2
-3A-4B=2
(1)*3+(2)
B=-8
A=10
则x+2/(x-4)(x-3)=10/(x-4)-8/(x-3)
-2x/(4-x)(3-x) =A/(4-x)+B/(3-x)
3A+4B=0
A+B=2
(1)-(2)*3
B=-6
A=8
则-2x/(4-x)(3-x) =8/(4-x)-6/(3-x)
再问： 0 0····那个是逗号、、不是一个相减的式子·········x+2/(x-4)(x-3）和 -2x/(4-x)(3-x) 通分……orz
再答： x+2/(x-4)(x-3)-2x/(4-x)(3-x) =x+2/(x-4)(x-3)-2x/(x-4)(x-3) =（x+2-2x)/(x-4)(x-3) ==（2-x)/(x-4)(x-3)
A+B=2
-3A-4B=2
(1)*3+(2)
B=-8
A=10
则x+2/(x-4)(x-3)=10/(x-4)-8/(x-3)
-2x/(4-x)(3-x) =A/(4-x)+B/(3-x)
3A+4B=0
A+B=2
(1)-(2)*3
B=-6
A=8
则-2x/(4-x)(3-x) =8/(4-x)-6/(3-x)
再问： 0 0····那个是逗号、、不是一个相减的式子·········x+2/(x-4)(x-3）和 -2x/(4-x)(3-x) 通分……orz
再答： x+2/(x-4)(x-3)-2x/(4-x)(3-x) =x+2/(x-4)(x-3)-2x/(x-4)(x-3) =（x+2-2x)/(x-4)(x-3) ==（2-x)/(x-4)(x-3)
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