1) Phan tich da thuc sau thanh nhan tu: x2-x-2008.2009
2) Chung minh rang voi moi x,y,z ta luon co: x2+4y2+z2>=2x+12y+4z
3) Cho a-b=4. Tinh gia tri cua bieu thuc: a3-12ab-b3
cac ban lam duoc cau nao thi giup mik nha. mik dang can gap lam
cho 2 bieu thuc A=x+x^2/2-x va B=2x/x+1+3/x-2-2x^2+1/x^2-x-2 a, tinh gia tri cua A khi /2x-3/=1 b,tim dieu kien xac dinh va rut gon bieu thuc B c,tim so nguyen x de P=A.B dat gia tri lon nhat
mk dang can gap
cho phuong trinh (an x):(m-1)x +m^2 -1=0(1) a,giai phuong trinh (1) voi m=2 b, tim gia tri cua m sao cho phuong trinh (1) nhan x=3 lam nghiem
mk dang can gap .cam on truoc a
giai giup minh voi, minh dang can gap
giai chi tiet giup minh may bai nay nha
1 gia tri x>0 thoa man
(2x-3)2=(x+5)2
2 gia tri lon nhat cua -3x2-6x-4
3 tim gia tri cua x+y biet
x-y=2 ; x*y=99 va y <0
4 nghiem cua phuong trinh
(2x-3)2-4x2-297=0
giup minh cau nay nhe
tim gia tri nho nhat cua bieu thuc A= 4x(2x+1) - 2(2x-3)2
giup to 3 bai nay
1. gia tri x lon nhat thoa man : x2(5x-20)=15x
2 gia tri x >0 de -3x4+12x2+1 dat gia tri lon nhat
3. tap hop cac gia tri cua x thoa man : x4+x3+2x-4=0
ai giup minh giai bai nay voi
1<=z, y, z<=2
tim gia tri lon nhat
A=(x+y+z)(1/x+1/y+1/z)
may bai nay kho qua giup em , em dang can gap a