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Các câu hỏi tương tự
tinh: (1.2+2.3+....+99.100)-(1+3+...+99)-(2+4+....+100) Kiem tra so nao trong cac so sau tu 2 den 30
Tinh A=(5.6.7.8+6.7.8.9+....+50.51.52.53)-(5.6+6.7+....+50.51)-(5+6+...+50) kiem tra A so nao tu 20 den 30
TINH (5+10+15+...=2015)-(2+4+6+.....+100)
Kiem tra tong so nao chia het cho 2;3;4;5;6;8;9;10;11;12;15;18;20;25;30
Bai kiem tra chat luong hoc ki 1 mon toan 6 ko co ban nao bi diem duoi trung binh. So hoc sinh dat loai trung binh bang 60% so hoc sinh ca lop. So hoc sinh dat diem kha bang 2/7 so hoc sinh ca lop. Biet rang lop 6a co khoang tu 30 den 40 hoc sinh va tat ca deu tham gia kiem tra. Hoi bai kiem tra do co ? hoc sinh gioi
bai1.Tinh tong cua cac so nguyen am tu -1738 den -16
bai2.Tinh tong sau bang 2 cach
A=1+(-2)+3+(-4)+....+99+(-100)
tap hop C = [ 8,10,12:....:30] co [30-8] :2+1 phan tu
- tap hop cac so chan tu so chan a den so chan b co [ 30-8] : 2 + 1 phan tu
- tap hop cac so le tu so le m den so le n co [ n - m] :2 +1
hhay tinh so phan tu cua cac tap hop sau:
D = [ 21;23;25......;99]
E = [ 32;34;36;....;96]
1.so cac so co 2 chu so khac nhau duoc viet boi cac so : 0,1,2
2.Nguoi ta viet lien nhau cac so tu nhien tu 1 den 99 khi do chu so 4 duoc viet .........lan
3.trong cac so tu nhien tu 100 den 10000 co bao nhieu so ma trong cach viet cua no co dung 3 chu so giong nhau
bai 1cho so A 123456 ... 50515253 bang cach viet lien tiep cac so tu nhien tu 1 den 53a) hoi A co bao nhieu chu so tat cab) chu so 2 xuat hien bao nhieu lan c) chu so thu 50 la chu so naod) tinh tong cac chu so cua Abai 2viet lien tiep cac so tu nhien tu 5 den 90 ta duoc so B 5678910 .... 888990a)hoi B co bao nhieu chu so b) chu so 2 xuat hien bao nhieu lan c) chu so thu 50 la chu so nao d) tinh tong cac chu so cua Bban nao tra loi ho minh nhe minh tich ngay lap tuc
Đọc tiếp
bai 1
cho so A = 123456 ... 50515253 bang cach viet lien tiep cac so tu nhien tu 1 den 53
a) hoi A co bao nhieu chu so tat ca
b) chu so 2 xuat hien bao nhieu lan
c) chu so thu 50 la chu so nao
d) tinh tong cac chu so cua A
bai 2
viet lien tiep cac so tu nhien tu 5 den 90 ta duoc so B = 5678910 .... 888990
a)hoi B co bao nhieu chu so
b) chu so 2 xuat hien bao nhieu lan
c) chu so thu 50 la chu so nao
d) tinh tong cac chu so cua B
ban nao tra loi ho minh nhe minh tich ngay lap tuc
a)1.2+2.3+3.4+...+19.20
b)9+99+999+...+999...9(100 so 9)
c)999...9x222...2(100 so 9 va 100 so 2)
SOS!!!