tim x biet
/x+2013/+/x+2014/+/x+2015/=2
(/ la tri tuyet doi)
2014*gia tri tuyet doi cua x-12+(x-12)=2013*gia tri tuyet doi cua 12-x
tim so nguyen x, biet
a. 7 - x = 8 - ( -7 )
b. x - 8 = ( -3 ) = -8
tim so nguyen a, biet
a. gia tri tuyet doi a gia tri tuyet doi = 2
b. gia tri tuyet doi a + 2 gia tri tuyet doi = 0
a, 7-x=8-(-7)
=> 7-x=15
=> x= 7-15
=> x=-8
b, x-8=-3+(-8)
=> x-8=-11
=> x=-11+8
=> x=-3
tim x biet
tri tuyet doi cau x <k
tri tuyet doi cua x>k
tri tuyet doi cua x=k
tim gia tri cua x biet !4-!x-3!!=3
luu y:! la gia tri tuyet doi
tim cac so nguyen x , y , z thoa man :
/x-y/+/y-z/+/x-z/=2015
nham la tri tuyet doi
tim f(x) = x^2 + ax + b biet -1 <= x <=1 thi tri tuyet doi cua f(x) <= 1/2
tim f(x) = x^2 + ax + b biet -1 <= x <=1 thi tri tuyet doi cua f(x) <= 1/2
tim gia tri tuyet doi cua x biet: a)x=-1/7 b)x=1/7