0.3 x=1 0.2 1.2-0.3x
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0.3x²+x=0.83x²+10x=8(3x+5)²=493x+5=±7x=-4或2/3x²+3=2√3xx²-2√3x+3=0(x-√3)
分段函数 先求x-1≥1得到x≥2,由于条件数x≥1,故满足条件再求2x-3/x≥1,分两种情况当0
是这样的:x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)
1-0.5x/0.3-2/3x=0.3x/0.2x+1原方程为:1-5/3x-2/3x=3/2+1解之:1-7/3x=5/27/3x=1-5/2x=-3/2x3/7x=-9/14
0.125x+2.75=-1.25x移项(1.25+0.125)x=-2.75x=-2.75/1.375=20.35x-1.5=-2.15x+3.5移项(0.35+2.15)x=1.5+3.52.5x
2x²+x-4=0用配方法解,移项2x²+x=4方程两边同时除以2x²+(1/2)x=2配方x²+(1/2)x+(1/4)²=2+(1/4)²
当x=0时,f(x)不连续,故f(x)的原函数分成两部分:x>0,∫f(x)dx=∫x㏑(1+x^2)dx=(1/2)∫㏑(1+x^2)d(x^2)=(1/2)ln|ln(1+x^2)|+C1x
x²-3x+1=0除以x得x-3+1/x=0x+1/x=3(2)x²+1/x²=x²+2+1/x²-2=(x+1/x)²-2=3²
设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
1.20092.-13.4.05.176.2
x=0显然不是根两边同时除以x^2,得:x^2+1/x^2+2(x+1/x)-6=0令t=x+1/x,则x^2+1/x^2=t^2-2代入上式得:t^2-2+2t-6=0得:t^2+2t-8=0(t+
原式=x^4(x+x^2+x^3+x^4)+x^8(x+x^2+x^3+x^4)+.+x^2000(x+x^2+x^3+x^4)=0+0+0+.0=0
x*0.3+x*0.3-21=1/2x0.6x-0.5x=210.1x=21x=210如果本题有什么不明白可以追问,如果满意请点击“选为满意答案”
3x/2-2.8x=0.75x/2=3.5x=1.4
(0.3+x)*2=80.3+x=8÷20.3+x=4x=4-0.3x=3.77+5x=425x=42-75x=35x=35÷5x=71.3x-x=18.60.3x=18.6x=18.6÷0.3x=6
x/x(x-1)+2=2x/(x+1)1/(x-1)+2=2x/(x+1)x+1+2(x-1)(x+1)=2x(x-1)x+1+2x²-2-2x²-2x=0-x-1=0-x=1x=
x-2=0.5+1x=0.5+1+2x=3.5
0.3+0.3x=0.39x=0.32x-1.5x=7.6xx=00.36x÷0.3=1.2x=16(x+1.2)=18.6x=1.97x+2x=8.1x=0.9(x-5)÷3=1.7x=10.15(
2/x+18/x=18/(x-1/2)解1/x+9/x=9/(x-1/2)通分x-1/2+9(x-1/2)=9xx-1/2+9x-9/2=9xx=9/2+1/2x=10/2x=5
-1.5x^2+x=-0.51.5x^2-x-0.5=0(1.5x+0.5)(x-1)=0x1=-1/3,x2=1