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
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, 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
Viet tap hop A cac so tu nhien nho hon 40 la boi cua 6.
Viet tap hop B cac so tu nhien nho hon 40 la boi cua 9.
Goi M la giao cua hai tap hop A va B.
a) Viet cac phan tu cua tap hop M.
b) Dung ki hieu tap hop con de the hien quan he giua tap hop M voi moi tap hop A va B.
Mọt doan cong tac gom 80 nguoi trong do co 32 nu . Can phan chia doan thanh các to cong tac co so nguoi bang nhau. so nam, nu cua cac to deu bang nhau. Hoi co bao nhieu cach phan chia doan thanh cac to de moi to khong qua 10 nguoi?
Tim dieu kien cua so nguyen n sao cho phan so 1-2n/3n+2 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
Tim tong cac phan so lon hon -1/7 , nho hon -1/8 va co tu la -3 .
