1 x x^2)(x-1 x)^6的展开式中的常数项是

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解不等式组的题(1) 9-0.1X>=-11-0.2X=0(6) 3X+2>=2XX-43X

(1)9-0.1X>=-1①1-0.2X=0③由②得,X>3由③得,X≤6∴此不等式的解集为3<X≤6(6)3X+2>=2X①X-43X③由①得,X≥-2由②得,X<7由③得X<1.2∴此不等式的解集

已知xx-2x-1=0,求xxxx-xxx-5xx-7x+5的值拜托各位大神

xxxx-xxx-5xx-7x+5=(xx-2x-1)(xx+x-2)-10x+3=-10x+3由xx-2x-1=0得x=1±√2所以,xxxx-xxx-7x+5=-7±10√2

已知X*X-5X+1=0,求X*X+1/XX的值

∵x²-5x+1=0两边同时除以x得∴x-5+1/x=0∴x+1/x=5两边同时平方得∴x²+2+1/x²=25∴x²+1/x²=25-2∴x

1.x-3(x-2)≥4 2.3-xx-1 4x/3+3/2<-x/6

1.x-3(x-2)≥4(1)1+2x/3>x-1(2)由(1)得:x≤1,由(2)得:x

1、成语填空Xx和谐2、晨X暮x

琴瑟和谐,晨钟暮鼓

已知x+1/x=3,求(xx)/(xxxx+xx+1)的值

(xx)/(xxxx+xx+1)=x^2/(x^4+x^2+1)=1/x^2+1+x^2=x^2+1/x^2+2-1=(x+1/x)^2-1=3^2-1=8

一道平方差公式的题:3x(x+2)+(x+1)(x-1)=4(xx+2)

3x(x+2)+(x+1)(x-1)=4(xx+2)3x²+6x+x²-1=4x²+86x=8+16x=9x=3/2

xxx+xx+x+1求x^ 2008

x^3+x^2+x+1=0求x^2008因为(x^4-1)=(x-1)(x^3+x^2+x+1)=0所以x^4=1x^2008=(x^502)^4=1

解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20

方程左边1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20)对分母因式分解得1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(

如果x=300,则xx−3-x+6x2−3x+1x的值为(  )

原式=xx−3-x+6x(x−3)+1x=x2x(x−3)-x+6x(x−3)+x−3x(x−3)=x2−x−6+x−3x(x−3)=x2−9x(x−3)=(x−3)(x+3)x(x−3)=x+3x,

解决数独问题x 1 x 7 x x x 3 xx x x x 4 x 2 x x9 x 3 6 x 8 7 x 58 x

确实没有好的办法,只能用尝试法了.A1有三个候选数2、4、5,使用NakedQuads方法,去除了一个候选数5,剩下候选数2、4尝试在A1填入2,最后无解尝试在A1填入4,得到最终解*--------

小数奥数网xx(x +1)x(x+ 2)x(x +3)=360怎样算?

x和乘号混淆了360=2X2X2X3X3X52X2=42X3=636=3X4X5X6所以x=3

已知x/(xx+x+1)=a,求xx/(xxxx+xx+1)的值

x/(xx+x+1)=a分子分母除以x,1/(x+1+1/x)=a,x+1/x=1/a-1,两边平方xx+2+1/xx=(1/a-1)^2xx+1/xx=(1/a-1)^2-2xx/(xxxx+xx+

已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy的值.

xx+yy+4x-6y+13=0整理得:(x+2)^2+(y-3)^2=0那么只有(x+2)=0(y-3)=0x=-2y=3(x^2-2x)/(x^2+3y^2)=(4+4)/(4+3*9)=8/31

已知x(x+1)-(xx+y)=3,求(xx+yy)/2-xy的值

x^2+x-x^2-y=3x-y=3(x-y)^2=9x^2+y^2-2xy=9(x^2+y^2)/2-xy=9/2

x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值

x(x+1)-(xx+y)=-3x^2+x-x^2-y=-3x-y=-3(xx+yy)/2-xy=(x^2+y^2-2xy)/2=(x-y)^2/2=(-3)^2/2=9/2再问:是对的吧!再答:当然

帮我做做 初三的题目吧! 2xx-5x+3=0 xx-3x-1=0 5xx=2x+1 2(x+3)(x+3)=3x+19

这题目是4方程?xx是x的平方吗?若是的话1.2x方-5x+3=0(2x-3)(x-1)=0x1=2/3(二分之三)x2=1十字相乘配下就出来了2..x方-3x-1=0公式法△=b方-4ac=9+4=