cho bieu thuc :A=2n+1/n-3+3n-5/n-3-4n-5/n-3.a, tim n de a nhan gia tri nguyen .b,tim n de a la phan so toi gian
1,So nguyen a phai co dieu kien gi de ta co phan so
A, 15 / a -1
B, 2a / 5a +30
2, so nguyen a phai co dieu kien gi de ta co dong thoi cac phan so
C, 13 / a + 1
D, a+3 / a -2
E, 2a - 5/ 3a - 9
1, tim x thuoc Z de cho cac phan so sau la so nguyen
A, x+1 / 3
B, 17 / x -1
2, tim x thuoc Z de cho cac phan so sau dong thoi co gia tri nguyen
C, -12 / x
D, 15 / x -2
E, 8 / x +1
tim phan so duong nho nhat de khi nhan no voi moi 1 phan so sau deu dc ket qua la so nguyen : 3/4 : 6/5 : 9/10
tim phan so duong nho nhat de khi nhan no voi moi 1 phan so sau deu dc ket qua la so nguyen : 3/4 ; 6/5 ; 9/10
tim phan so duong nho nhat de khi nhan no voi moi 1 phan so sau deu dc ket qua la so nguyen : 3/4 : 6/5 : 9/10
tim n de phan so sau toi gian : \(\dfrac{-3}{5-n}\)
tim cac so nguyen sao cho n-1 la uoc cua 15
Cho phan so A= n-2/n+3
Tim n de
a) a la phan so
b) A thuoc Z
