1÷(4 5x-1 5)=3-搜答案-神马作文网

5X+2X=427X=42X=42/7x=615+2X-3=482X=48-15+32X=36X=182X+3X+17=375X=20X=46X-3X=6÷53X=1.2X=0.49x一2x=1.4十

1+(2x-4)/(x^2-a-2)]/[(x+3)/(x^2-1)]={1+2(x-2)/[(x-2)(x+1)]}(x^2-1)/(x+3)=[1+2/(x+1)](x+1)(x-1)/(x+3)

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)

原式=(3x²+3x-x²+x)/(x+1)(x-1)*x(x²-1)/x²(x²-4)=(2x²+4x)/(x+1)(x-1)*(x+1)

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583

x=1/x所以x=±1原式=(x+2)÷[(x+3)(x-3)/(x+3)]=(x+2)/(x-3)所以x=-1,原式=(-1+2)/(-1-3)=-1/4x=1,原式=(1+2)/(1-3)=-3/

（x+2/x²-2x-x-1/x²-4x+4）÷x-4/x={(x+2)(x-2)/[x(x-2)²]-x(x-1)/[x(x-2)²]}·x/(x-4)={(

好的.把下面的通分嘛.用90来分.这样一通就是了.X＝117/16

注意：本题x=2时题目没意义,应该舍去（这是很多学生错误所在）这里x只能取根号2-1

X/3+X/15+X/35+X/63+X/99=1(1/3+1/15+1/35+1/63+1/99)X=15/11X=1X=11/5

X(X^2-6X-9)-X(X^2-8X-15)+2X(3-X)=X^3-6X^2-9X-X^3+8X^2+15X+6X-2X^2=12x带入X=1/3原式=12*1/3=4

x/2（1/1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)=1x/2*10/11=110x=22x=11/5这回的方法是你想要的了吧

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/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=1/3[1/x-1/(x+3)]+[1/(x+3)-1/(x+6)]+.+[1/(x+15)-1/(x+18)

x-5/8x=15(3/8)x=15x=15*(8/3)x=401/5x+3/10x=1202/10x+3/10x=1205/10x=120x=120*2x=24020%x=30x=30/20%x=1

2x-6/4-4x+x^2÷x-3/x-2=-2x-7/2+x-3/x=-x-3/x-7/2=1+3-7/21/2

再答：采纳哟

X+15=3X-1 jiji

15+1=3x-x16=2xx=16/2x=8

3x+1=15-x

.3x+1=15-x3x+x=15-14x=14x=14/4x=7/2.

=[3/(x+1)-(x-1)]÷(x²-2x)/(x+1)=[3/(x+1)-(x-1)(x+1)/(x+1)]÷x(x-2)/(x+1)=[3-(x+1)(x-1)]/(x+1)÷x(x