cho tong n = 10x10x10x10x10 +71 khong thuc hien phep chia cho 9 ,hay giai thich xem tong tren co chia het cho 9 hay khong .neu so hang thu 1 = 1999 thua 10 co chia het cho 9 hay khong ,tai sao giup minh voi
1.Co bn so co 3 chu so chia het cho 2 ma ko chia het cho 3
2.Viet so tu nhien lon nhat co 4 chu so ma tong 4 chu so bang tich 4 chu so
3.Viet so tu nhien lon nhat co 5 chu so ma su dung 3 chu so khac nhau
4.Tinh tong tat ca cac so co 4 chu so chia het cho 2 va 3
5.Co bn so co 4 chu so ma tich 4 chu so do bang 12
Cac ban giai giup minh nha ,minh dang can gap
hay cho biet TBC cua tat ca cac so le co 3 chu so chia het cho 5
P/s:giai thich ro giup minh
1 hinh thang co tong do dai 2 day la 42 cm,chieu cao bang day be , day be bang 3 phan 4 day lon . tinh dien tich hinh thang
mong cac ban hay giai cho minh ma hay co loi giai phep tinh va dap so nhe ban nao giup minh thi minh thich ca
Mot nguoi di xe may khoi hanh tu tinh A luc 6 gio 30 phut va den tin B vao luc 14 gio . Tinh A cach tinh B 144km . Tinh van toc cua xe may biet doc duong nguoi ay nghi mot lan 2 gio va mot lan khac het 1 gio 30 phut ?
Giai day du giup minh nha . Minh tick cho
Cho hinh thang ABCD co day lon BC=13,5cm.Keo dai day DC1 doan CM=4,5cm thi dien tich tang 18cm2.Tinh dien tich ABD biet AB =2/3 CD.
Giup minh chut nha(ko can loi giai cung duoc , ma co thi cang tot de minh hieu.mong cac ban se giup minh.ai nhanh se duoc minh "tich" nha)
Minh se tich 10 ban nhanh nhat
CHO A=1/2+1/6+1/12+1/20+1/30+......+1/n
biet A =49/50 TIM n
GIUP MINH NHA CAC BN
Tinh tong :
A = 1/1*3 + 1/3*5 + 1/5*7 + ..... + 1/99*101
B = 1 + 1/3 + 1/6 + 1/10 + ..... + 1/630
Giup minh voi nha ! Ai dung minh *** cho !
Giai ro rang ho minh voi !
co bao nhieu so tu nhien co 4 chu so,so tan cung bang 1 va chia het cho 3???
cam on cac ban tra loi giup minh