百度作业网解方程25%x=(54-x)x20%
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/14 23:59:02
设a=√x,b=√(x+5)则x=a²,x+5=b²∴a²+5=b²,即b²-a²=5.故25-2x=5×5-2x=5(b²-a&
x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1
2x(x-1)-x(3x+2)=-x(x+2)-122x^2-2x-3x^2-2x=-x^2-2x-122x^2-3x^2+x^2-2x-2x+2x=-12-2x+12=0-2(x-6)=0x-6=0
x+25%x=10x+0.25x=101.25x=10x=8x-75%x=2.5x-0.75x=2.50.25x=2.5x=10128%x-x=2.81.28x-x=2.80.28x=2.8x=10
(x²-x+4)x-(x-1)(x²+2)=x+7x³-x²+4x-x³+x²-2x+2=x+72x+2=x+72x-x=7-2x=5
(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=(x/2)*(2/x(x+2))+(2/(x+2)(x+4))+.+2/(x+8)(x+10)=(x/2)*[1/x
X/(x-30)=(x+40)/XX^2=(X-30)*(X+40)X^2=X^2+40X-30X-120010X=1200X=120
只有一个实根.设f(x)=x^3+2x-19为单调增函数.所以只有一个实根.下面来求这个实根由于f(2)=-7f(3)=11所以这个根在（2,3）内.利用二分法求这个解.取x0=5/2f(5/2)=1
6*25^x=9^x+15^x6*5^(2x)=3^(2x)+3^x*5^x6*5^x/3^x=3^x/5^x+1,上下除以3^x*5^x,∵15^x≠06*(5/3)^x=(3/5)^x+16=(3
4/5x+x/(5x-25)=5/(x^2-5x)(4x-20)/5x(x-5)+x^2/5x(x-5)=25/5x(x-5)4x-20+x^2=254x+x^2=45x^2+4x+2^2=45(x+
x-25%x=270.75x=27x=27÷0.75x=36
x^3-x^2-2x=0x(x^2-x-2)=0x(x-2)(x+1)=0x=0或x=-1或x=2
x-25%X-(25%x-25)=50x-0.25X-0.25X+25=500.5X=25X=50再问：很快，谢谢你
（2x+5)(4x*x-10x+25)=8x(x*x+1)8x^3-20x^2+50x+20x^2-50x+125=8x^3+8x,8x=125,x=125/8或利用立方和公式8x^3+125=8x^
本人提供一个解法：由于(x-2004)/(x-2005)=1+1/(x-2005),其它三个分式同样进行拆分,最终得出：[1+1/(x-2005)]-[1+1/(x-2006)]=[1+1/(x-20
x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)
(x+x)+(x-x)+(xx)+(x/x)=1002x+0+x²+1=100x²+2x+1=100（x+1）²=10²x+1=10或x+1=-10x=9或x=
1.8x=54x=54÷1.8x=30
90+25=x+x115=2xx=115/2=57.5
X+60%X=0.5248X-25%X=0.5227X-35%X=0.52这道题相当于三道小题,可以分别解答,会得到三个答案.