(x-2分之一1 2)(x-2) (x-1)方-搜答案-拍题作业网

即1/(x+10)+1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+……+1/(x+9)-1/(x+10)=2所以1/(x+1)=2x+1=1/2x=-1/2

注：下面^2符号表示平方,1/x表示x分之一x-1/x=2∴(x-1/x)^2=x^2-2+1/x^2=4∴x^2+1/x^2=6同理啊：(x^2+1/x^2)^2=x^4+2+x^4=36x^4+2

由于f(x)是奇函数,考虑x>0时的函数.根据基本不等式,2x+1/x≥2√2,当且仅当x=√2/2时取得最小值2√2.（√2表示根号2）①0

因为x-(1/x)=3所以[x-(1/x)]²=3²x²+(1/x²)-2×x×(1/x)=9x²+(1/x²)-2=9所以x²+

（1）对数性质,alog(x)y=log(x)y^a（2）换底公式log(1/2)x=(log2x)/(log21/2)=-log2x

1/x（x+3)+1/（x+3)(x+6)+1/（x+6)(x+9）=3/2（x+9)（1/3）×[3/x（x+3)+3/（x+3)(x+6）+3/（x+6）（x+9)]=3/2（x+9）（1/3)[

原式=(6x²+3x+2)/(6x³)

1/(x+1)-1/(x+2)=1/(x+9)-1/(x+10)1/(x+1)(x+2)=1/(x+9)(x+10)所以(x+1)(x+2)=(x+9)(x+10)x²+3x+2=x

1.1/(x-1)(x-2)+1/(x-2)(x-3).+1/(x-n)(x-n-1)=[1/(x-2)-1/(x-1)]+[1/(x-3)-1/(x-2)]+.+[1/(x-n-1)-1/(x-n)

已知x+x分之一=2分之5,则（x+x分之一）²=4分之25,即x²+2+x平方分之一=4分之25所以x²+x平方分之一=4分之17,(x-x分之一)²=x&#

1/x(x+1)+1/(x+1)(x+2)+.+1/(x+8)(x+9)=(2x+3)/x(x+9)1/x-1/(x+1)+1/(x+1)1/(x+2)+.+1/(x+8)-1/(x+9)=(2x+3

原式=[1/(x-2)-1/(x+2)]*(x-4)；用乘法分配率=(x+2)-(x-2)=4

再答：望采纳

1/x(x+1)=1/x-1/(x+1)1/(x+1)(x+2)=1/(x+1)-1/(x+2)后面以此类推原式=1/x-1/(x+1)+1/(x+1)-1/(x+2)+……+1/(x+1998)-1

x²+1/x²-3(x+1/x)+2=0(x+1/x)²-3(x+1/x)=0(x+1/x)(x+1/x-3)=0x+1/x=0x²=-1(舍去）x+1/x-3

已知x+x分之一等于M,则2X方+2X方分之一=2(x²+1/x²)=2[(x+1/x)²-2]=2[M²-2]很高兴为您解答,skyhunter002为您答疑