(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:灵鹊做题网作业帮 分类:数学作业 时间:2024/05/15 09:51:34
(X+5)/(X+4) +(X+8)/(X+7 )=(X+7)/(X+6 )+(X+6)/(X+5 )
(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
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)