x,-2x^2,3x^3,-4x^4,5x^5,-6x^6……第n个式子是多少
x,-2x^2,3x^3,-4x^4,5x^5,-6x^6……第n个式子是多少
x^2/3,-x^3/15,x^4/35,-x^5/63,x^6/99,照此规律,第十个式子是( ),第n个识式子是(
观察:-x,3x^2,-5x^3,7x^4,...,-37x^19,39x^20,第n个式子是?
一.x,3x^2,7x^3,15x^4,31x^5…….按此规律写出的第六个式子是?第n式子是?
一组按规律排列的式子:x^3/y,-x^5/y^2,x^7/y^3,-x^9/y^4,……(xy≠0),其中第n个式子是
1/x,-2/x^2,4/x^3,-8/x^5,16/x^5,第n个分式是?
1x+2x+3x+4x+5x+6x+7x…+99x=100
单项式2x,-4x^3,8x^5,-16x^7,32x^9,写出第N个单项式
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
-x,x^2,-2x^3,3x^4,-5x^5,8x^6 按此规律写出第八个式子
已知:单项式-x;2x^2;-3x^3'4x^4;-5x^5…请你写出第N项是多少?为什么等于那个结果?
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?