(X+5)/(X+4) ＋(X+8)/(X+7 )=(X+7)/(X+6 )＋(X+6)/(X+5 )

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/29 07:47:23

(X+5)/(X+4) ＋(X+8)/(X+7 )=(X+7)/(X+6 )＋(X+6)/(X+5 )
移项得到 (X+5)/(X+4)-(X+6)/(X+5 )=（X+7)/(X+6 )-(X+8)/(X+7 )
两边分别通分得到 [(x+5)(x+5)-(x+6)(x+4)]/(x+4)(x+5)=[(x+7)(x+7)-(x+8)(x+6)]/(x+6)(x+7)
将分子的括号打开得到 1/(x+4)(x+5)=1/(x+6)(x+7)
得到 x^2+13x+42=x^2+9x+20
所以 4x=-22
x=-11/2

x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 2x+3x+4x+5x+x+6x+7x=100 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10), 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值求方程解x-5/x-4+x-9/x-8=x-8/x-7+x-6/x-5 x-4/x-5-x-7/-x-8=x-5/x-6-x-8/x-9 解分式方程：(x-4)/(x-5)+(x-8)/(x-9)=(x-7)/(x-8)+(x-5)/( x-6) 解分式方程（X-4)/(X-5)-(X-5)/(X-6)=(X-7)/(X-8)-(X-8)/(X-9) 解方程：(x-4)/(x-5)-(x-5)/(x-6)=(x-7)/(x-8)-(x-8)/(x-9)