Chung minh dang thuc

x^31+x^30+.....+x+1=(1+x)(1+x^2)(1+x^4)...(1+x^16)

Giup minh nha

Tim cac so nguyen x,y biet:a)*x2 -3*x+1 chia het cho x+2 b)x2-xy = 5x-4y-9 c) (x2-8)*(x2-15)<0 d) (x+1)2+(y+1)2+(x-y)2=2 e) (x2-4)x2>0 ai lam truoc minh tick,mai minh di hoc rui,lam giup minh di pls Thank ban truoc ne ;(

1.Cho A=1/1.2+1/3.4+...+1/99.100

C/m :7/12<A<5/6

2.Tim x:

a.2/(x+2)(x+4)+4/(x+4)(x+8)+6/(x+8)(x+14)

b.x-10/30+x-14/43+x-5/95+x-148/8=0

Lam giup minh nhe 

Minh dang can gap

1.   tim cac cap so nguyen duong (x, y) sao cho:

2 x³ + xy = 11

2.   tim cac cap so nguyen duong (x, y, z)sao cho:

x + y + z = x*y*z

3.   tim x thuoc z, biet;

|x| = -2003

|x| = |-2003|

minh dang can gap lam. chieu mai phai nop rui

Xác định a để da thucx^3+x^2+a-x chia hết cho ( x+1 )^2

Tìm a,b,c sao cho

a, \(\frac{1}{x\left(x+1\right).\left(x+2\right)}=\frac{a}{x}+\frac{b}{x+1}+\frac{c}{x+2}\)

cac ban oi giup minh di. minh dang can gap lam. lam on

1.     55 x 30 x 2 + 110 x 50 + 55 x 40 / 24 x 47 +8 x 23 x 3 + 3 x 30 x 8

2.    9,6 : (1,32 +3,48) - 0,5 + 1 1/2 x 2 3/4  - 1 1/2 x 1 1/4

(lam cho mik vs .Mik cam on)

bieu thucx^3 + ax^2 +2x +b chia het cho x^2 + x+ 1. Vay (a;b)=?

giai pt: a) x²+(x²+4)-3x(x²+1)+1=0

    cac ban viet buoc giai cho nhe!!  minh dang can gap lam !!