Tham khảo: https://olm.vn/hoi-dap/question/94678.html
Tham khảo: https://olm.vn/hoi-dap/question/94678.html
bai 1
cho bieu thuc A = 5/n+1 voi N THUOC Z
a, de A la phan so thi n co dieu kien gi ?
b , tim tat ca cac gia tri nguyen cua n de gia tri A la 1 so nguyen ?
bai 2
cho bieu thuc M = 6/n-3 voi n thuoc Z .Co bao nhieu gia tri cua n de :
a, M ko phai la phan so
b , M la phan so va cp gia tri nguyen ?
bai 3 viet tap hop cacs so nguyen sao cho :
-12/4 < x <6/3
Cho phan so A= n-2/n+3
Tim n de
a) a la phan so
b) A thuoc Z
tim n de phan so sau la toi gian :
a, \(\dfrac{-3}{5-n}\) b,\(\dfrac{3n+2}{5n+3}\)
voi gia tri nao cua x thuoc Z cac phan so sau co gia tri la 1 so nguyen
d.D= \(\dfrac{x^2-1}{x+1}\)
chung minh cac ps sau day la toi gian
b, \(\dfrac{n-1}{n-2}\)
chung minh cac phan so sau day la toi gian :
a, \(\dfrac{n+4}{n+3}\) b, \(\dfrac{n-1}{n-2}\)
tim cac gia tri nguyen cua n de phan so A=3.n+2/n-1 co gia tri la so nguyen
Bai1.Tim cac p/s bang p/s 34/51 va co mau la so tu nhien <16
Bai 2.Tim n thuoc z de 5/n-4la 1 so nguyen.
Tim n thuoc N : 10^n - 1 chia het cho 9
n=7a5+8b4
biết a-b =6 và n chia hết cho 9 tim a,b