=> x + 4 chia hết cho 2x + 1
vì x + 4 chia hết cho 2x + 1
=> 2(x+4) chia hết cho 2x + 1
2(x + 4) = 2x + 8 = 2x + 1 + 7
vì 2x + 1 chia hết cho 2x + 1
=> 7 phải chia hết cho 2x + 1
=> 2x + 1 \(\in\) Ư (7) = { 1 ; -1 ; 7 ; -7 }
ta có bảng
vậy x = {0 ; 1 ; 4 ; -3}
choo bieu thuc
A=2x+1/x-3
a, tinh gia tri cua A khi x2=4
b, tim x de A=1/3
c, tim x thuoc z de A co gia tri nguyen
1.Tim cac chu so x va y de so 1x8y2 chia het cho 36
2.tim cac gia tri nguyen cua n de phan so A=3.n+2/n-1 co gia tri la so nguyen
3.tim cac chu so x y thoa man
(x-2)^2.(x-3)^2=4
4.tim so tu nhien x biet
(x-5):3/100=20.x/100 +5
tim so nguyen x de 2n+1/x-3 co gia tri la 1 so nguyen
hay tim gia tri x nguyen de 2x+1 chia hết cho x 1
giai nhanh ho minh voi
Cho cac bieu thuc
A=n+6 phan n-5 va B=3n-9 phan n-6
a/ Tim gia tri nguyen cua n de A, B la phan so ?
b/ Tim gia tri nguyen cua n de A, B co gia tri nguyen?
c/ Tim gia tri nguyen cua n de A, B co gia tri nguyen lon nhat?
Tim so nguyen x de /x/ +1 co gia tri nho nhat
tim gia tri nguyen cua x de 2x-1/2x+3 la so nguyen
help tim x nguyen co gia tri nguyen A=5/2x-1
A=n-1/n+2
a, Voi gia tri nao thi A la phan so
b, Tim so nguyen n de A=0
c,tim so nguyen n de A co gia tri nguyen
