Bai1:
a- 3x^2 - 7x +2 b- a(x^2 +1 ) - x (a^2 +1)
Bai2 : Cho bieu thuc
A= (2+x/ 2-x - 4x^2 / x^2 -4 - 2-x/ 2+x ) : x^2 - 3x / 2x^2 - x ^3
a- Tim DKXD roi rut gon bieu thuc A ?
b- Tim gia tri cua x de A>0?
c- Tinh gia tri cua A TRong truong hop : \vbar x-7 \vbar=4
Giup mk nha moi nguoi !!!!!!!!!
Chung minh voi x\(\ne\)\(\pm\)1, gia tri cua bieu thuc sau khong phu thuoc vao gia tri cua bien:
A=(\(\dfrac{x+3}{2x+2}\)+\(\dfrac{3}{1-x^2}\)-\(\dfrac{x+1}{2x-2}\))\(\div\)\(\dfrac{3}{2x^2-2}\)
Tìm gia tri nho nhat cua bieu thuc A= x^2-x
cho a,b,c la ba so duong .tim gia tri lon nhat cua bieu thuc:
P = \(\dfrac{a}{a^2+1}+\dfrac{b}{b^2+1}+\dfrac{c}{c^2+1}\)
Cho phan thuc : \(\dfrac{x^2-10x+25}{x^2-5x}\)
Tim gia tri cua x de phan thuc co gia tri nguyen
cho x,y lon hon 0 thao man x.y=1 tim gia tri nho nhat cua M=x^2+y^2+3/x+y+1
Giải các bất phương trình sau:
a) ( x - 1 )( x + 3 ) < 0
b) ( 2x - 1 )( x + 2 ) > 0
c) \(\dfrac{3x-2}{2x-1}\) > 0
d) \(\dfrac{3x+2}{x+1}\) > 2
1. Giải các phương trình sau:
a. x-\(\dfrac{5x+2}{6}\)=\(\dfrac{7-3x}{4}\)
b. (3x-1)(x-3)(7-2x)=0
c. /3x/=4x+8
2. Giải bpt:
2x(6x-1)≥(3x-2)(4x+3)
(x2-3x+3) (x2-2x+3)=2x2
