Cho day so 1 , 4 , 9 , 16 , 25 , ...........
a) Tim so hang thu 20 cua day so.
b) So 92 co phai la mot so hang cua day so do khong ?
Cho day so ; 1, 2 , 4 , 8 , 16 ,.......................... Hoi so 123 co phai la mot so hang cua day so do khong ?
cho phan so a/b khac 0, toi gian.biet rang neu cong ca tu so va mau so voi tu so cua phan so cua phân so da cho thi duoc phan so moi bang mot nua phan so da cho.khi do gia tri cua hieu a-b la..........................................
Cho day phan so:
\(\frac{1}{1};\frac{1}{2};\frac{2}{1};\frac{1}{3};\frac{2}{2};\frac{3}{1};\frac{1}{4};\frac{2}{3};\frac{3}{2};\frac{4}{1}\)
Tim ra phan so 50 cua day so tren
Trong 1 lop 60% so hs gioi la 9 em
a)tinh so hs gioi cua lop
b)2/3 hs kha = 80% HSgioi. tim so hs kha cua lop
C)biet lop chi co gioi va kha. tim tong so hs cua lop
ai nhanh mk tick cho
Bai 1: Tim 3 so nguyen to a, b, c khac nhau sao cho abc < ab + bc + ac
Bai 2: Tim 4 so tu nhien sao cho tong nghich dao cac binh phuong cua chung bang 1.
Moi nguoi trinh bay day du giup minh nhe! (Love)
Tim so bi tru, biet hieu cua hai so bang so tru va so bi tru lon hon so tru la 26.
Dap an : ......................
1 lớp duoc thuong 60 phan quà biet so hoc sinh nam gap doi so hoc sinh nu.Tính so hoc sinh nam va hoc sinh nu ( phan qua cua cac ban la nhu nhau )?
giup mình nha minh dang can gap!!!
Cau 1:Tinh A=1/4.9 + 1/9.14 + 1/14.19 + ... + 1/64.69
Cau 2:a.Tim STN nho nhat,biet rang so do khi chia cho 3,cho4,cho 5,cho 6 deu du la 2,con chia cho 7 thi du 3.
b.Tim 2 STN biet tong UCLN va BCNN cua chung = 23
c.Tim STN x;y biet 32x1y chia het cho 45
