Lop 9a du dinh trong 420 cay xanh.den ngay thuc hien co 7 ban khong tham gia do duoc trieu tap boi duong doi tuyen hsg cua nha truong nen moi ban con lai phai trong them 3 cay moi dam bao ke hoach dat ra.hoi lop9a co bao nhie hs?
bai toan:ko thuc hien phep chia,hay tim so du la f(x) cho g(x) trong cac truong hop sau:
tim so tu nhien co hai chu so .Biet rang tong cac chu so bang 6 va neu them vao so don vi thi duoc mot so cung viet bang cac chu so do nhung theo thu tu nguoc lai
Tim cac so nguyen y sao cho bieu thuc 2377-9y^2-6y la binh phuong mot so tu nhien
so cac so tu nhien co 5 chu so
co hay khong so tu nhien n de 2006 + n^2 la so chinh phuong.
cho 5 so tu nhien bat ky sao ki khong co so naof chia cho 5 cm tinh hoan vi cua hieu hai so trong chung chia het cho 720
cho cac so 1,2,3,4,5,6,7. hoi co the lap duoc bao nhieu chu so ma moi so gom dung 5 chu so doi mot khac nhau va trong moi so duoc sap xep theo thu tu tang dan tu trai qua phai.
Tim cac gia tri cua m de tap nghiem cua phuong trinh x4 - 2(m-1)x2 -(m-3)=0 co
a, 4 phan tu
b, 3 phan tu
c, 2 phan tu
d, khong co phan tu nao (vo nghiem)