x² 3x-(20÷x² 3x)=8
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![x² 3x-(20÷x² 3x)=8](/uploads/image/f/898575-15-5.jpg?t=x%C2%B2+3x-%2820%C3%B7x%C2%B2+3x%29%EF%BC%9D8)
(x+1-1/1-x)÷(x-x²/x-1)=[(x+1)+1/(x-1)]×[-(x-1)/x(x-1)]=(x²-1+1)/(x-1)×(-1/x)=-x/(x-1)(x-4/
4/3x=20x=15
解题思路:分式的混合运算,按照分式运算法则进行计算。解题过程:
原式=4x-60x+3x^2=5x-140x+7x^24x^2-79x=0x=0或者x=7/4
x-60+3x=3x-63+7x4x-60=10x-634x-60+63=10x4x+3=10x3=10x-4x3=6xx=1/2
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)=2(x-3)/(x-2)^2X(x+3)^2/(3-x)X(2-x)/(x+3)=2(x-
1/x(x+1)+1/x(x+1)(x+2)+1/x(x+2)(x+3)+.+1/x(x+2007)(x+2008)=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/2007-1/
解由x/(x-1)-1=3/(x-1)(x+2)知两边乘以(x-1)(x+2)得x(x+2)-(x-1)(x+2)=3即x^2+2x-(x^2+x-2)=3即2x^2+x-1=0即(2x-1)(x+1
方程的两边同乘x,得x|x|-4=3|x|,当x≥0时,x2-3x-4=0解得x=-1或4.∴x=4,当x<0时,x2-3x+4=0此方程无解,检验:把x=4代入x=4≠0.∴原方程的解为:x=4.
4x-60x+3x*x=5x-140x+7x*x4x*x-79x=0x(4x-79)=0x=0或x=79/4
能看懂的话在继续研究吧,太复杂了.
=【3x(x+1)-x(x-1)]/(x+1)(x-1)×(x+1)(x-1)/x=(3x²+3x-x²+x)/x=4
[3x/(x+2)-x/(x-2)]÷2x/(x^2-4)分子分母同时乘以x²-4=[3x(x-2)-x(x+2)]/2x=(3x²-6x-x²-2x)/2x=(2x
是6X的平方再问:是6(x²)还是(6x)²再答:6(x²)再问:谢谢,
#includesintjiesheng(intn)//用于计算阶乘如:3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x
8.5
原方程变形为:x+1x+2-x+2x+3=x+7x+8-x+8x+9,去分母,得(x+2)(x+3)=(x+8)(x+9),整理,得12x+66=0,解得x=-5.5,经检验,x=-5.5是原方程的解
等于(x-1)(x-2)(x-3)(x-4)...(x-50)的导数
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)=x((2x-1)/x)+x/(x^2-2x)x(x^2-4)/(3-x)=(2x-1)+(x+2)/(3-x)=(7x-3-2x^2