U=366...66(có 99 chữ số 6)
thank you ( nhớ k nha )
U=366...66(có 99 chữ số 6)
thank you ( nhớ k nha )
bai 1;tinh gia tri bieu thuc 17a+15b+6a+8b voi a+b =100
bai 2;tich cua 2 so la 6210.neu giam 1 thua so di 7 don vi thi tich moi la 5265.tim cac thua so cua tich
bai 3;co 5 so tu nhien nao ma tich cua chung bang1001 va chu so tan cung la 6
bai 4;tinh;333...3.999...9 trong do co 50 chu so 3 va 50 chu so 9
Voi sau chu so 3 va dau ngoac, dau phep tinh va so mu. Hay viet thanh bieu thuc co gia tri 106 bang 3 cach.
Tinh tong : 3+33+333+.....333....33 co 400 chu so 3
tinh tong: 2+22+...+222...2 o so hang cuoi cung co n chu so 2
Ta da biet : trong he so ghi so thap phan ,cu muoi don vi o mot hang thi lam mot trong muoi gia tri :
So abcd trong he thap phan co gia tri bang :
a.10^3+b.10^2+c.10+d
Co mot he so cu hai don vi o mot hang thi lam thanh mot don vi o hang tren lien truoc do la he nhi phan moi chu trong he hai gia tri nhi phan chang han abcd ,mot trong hai gia tri 0va 1 mot so trong he thap phan chang han abcd duoc ki hieu abcd
cho A=1-5+9-13+11-21+...Biet A=2013.hoi A co bao nhieu so hang ?/gia tri cua so hang cuoi cung
tinh gia tri cua bieu thuc a+b biet rang a la so nguyen am lon nhat co 2 chu so b la so nguyen am nho nhat co 2 chu so
giup minh voi cam on
dung nam chu so 5 ,dau cac phep tinh va dau ngoac (neu can ),hay viet mot bieu thuc co gia tri bang 6
A) cho A = 1-5+9-13+17-21+. . .biet A = 2013.hoi A co bao nhieu so hang? Gia tri cua so hang cuoi cung?
B) mot so tu nhien khi chia cho 15 du, chia co 18 du 17 . Hoi so do khi chia cho 90 du bao nhieu?