jcst.net
当前位置:首页 >> 1,x^30=x^2 *_______=(x^3 * _______)^2=(x * (%x... >>

1,x^30=x^2 *_______=(x^3 * _______)^2=(x * (%x...

三个解x1=2 x2=3 x3=-5 解题过程x^5-18x^3+30x^2-19x+30 =x(x^4-18x^2+81)+30x^2-100x+30 =x(x^2-9)^2+10(3x^2-10x+3) =x(x+3)^2(x-3)^2+10(3x-1)(x-3) =(x-3)[x(x-3)(x+3)^2+10(3x-1)] =(x-3)(x^4+3x^3-9x^2+3x-10) =(x-3)[(x^4+x^2)+(3x^3+3x)...

30x^4+60x^3-1110x^2+300x+5040=0 x^4+2x^3-37x^2+10x+168=0 f(x) =x^4+2x^3-37x^2+10x+168 f(3) =0 x^4+2x^3-37x^2+10x+168 = (x-3)(x^3+ax^2+bx-56) coef. of x -56-3b=10 b=-22 coef. of x^2 b-3a =-37 a =5 x^4+2x^3-37x^2+10x+168 = (x-3)(...

(x-30)/2=138-x-35-4 (x-30)/2=99-x x-30=198-2x 3x=198+30=228 x=76

证明:如果有整数x,y使方程成立, 则 由17*29-5 = 488 = 4x^2+12xy-8y^2 = (2x+3y)^2-17y^2 知(2x+3y)^2+5能被17整除. 设2x+3y=17n+a,其中a是0,±1,±2,±3,±4,±5,±6,±7,±8中的某个数,但是这时 (2x+3y)^2+5 =(17n)^2+34na+(a^2+5...

一种方法足己,没有更简单的了。

f(x)=x³-9x²+29x-30 f'(x)=3x²+18x+29 f''(x)=6x+18 拐点x=-3 令g(x)=(x+3)³-9(x+3)²+29(x+3)+C g(0)=27-81+98+C=0➝C=-33 g(x)=(x+3)³-9(x+3)²+29(x+3)-33 =x³+9x²+27x+27-9x²-54x-81...

如下

X是x的话 2x^2-60x=x+55 2x^2-59x=55 这个你会算吗? X是乘号的话 2x-60=x+55 2x-x=55+60 x=115

原解很对呀 lim【(2x-3)^20 * (3x+2)^30]/(2x+1)^50 】=lim(2-3/x)^20*lim(3+2/x)^30 / lim(2+1/x)^50 =【lim(2-3/x)】^20* 【lim(3+2/x)】^30 / 【lim(2+1/x)】^50 =2^20 * 3^30 / 2^50 =3^30/2^30 =(2/3)^30

好的。把下面的通分嘛。用90来分。这样一通就是了。X=117/16

网站首页 | 网站地图
All rights reserved Powered by www.jcst.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com