A= 6n-1 chia hết cho 3n-2
=> 3(6n-10) chia hết cho 3n-2
=> 18n-10 chia hết cho 3n-2
=> 6(3n-2) -2 chia hết cho 3n-2
=> 2 chia hết cho 3n-2
=> 3n-2E{-1; -2; 1;2}
=> 3nE{ 1; 0; 3; 4}
=> nE{ 0; 1}
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?
cho bieu thuc 2n+1/n+5(n thuoc Z)
a, tim n de Pco gia tri la 1 so nguyen
b,tim gia tri lon nhat,gia tri nho nhat cua P
Tim gia tri cua x de bieu thuc A=|x-3|+(-100)co gia tri nho nhat ,tim gia tri nho nhat ay
cho x+y=5 tim gia tri nho nhat cua bieu thuc A=|x+1|+|y-2|
a, tim gia tri nho nhat cua bieu thuc:
A=|1-x|+8 và giá tri tuong ung cua x
b, tim so nguyen x sao cho:
(x-5).(x+12)<0
Tim gia tri nho nhat cua bieu thuc: P=|x|+7
(x€Z)
Tim gia tri lon nhat cua bieu thuc :Q=9-|x|
tim gia tri nho nhat cua bieu thuc sau:
A=(x-1)2+2010
a, tim gia tri nho nhat cua bieu thuc :\(A=\)\(|x+19|+|y-5|+1890\)
b,tim gia tri lon nhat cua bieu thuc:\(B=-|x-7|-|y+13|+1945\)
CHO bieu thuc
B=17,58*43+57*17,58/293*A
a)tim gia tri cua bieu thuc Bkhi a=2
b)tinh gia tri a khi B=2
c)tim gia tri so tu nhien ad biet bieu thuc B co gia tri lon nhat ,gia tri lon do la bao nhieu
