Tong tong
B
= 1.2 cong 2.3 cong 3.4 ccong 4.5 cong ........... cong 99.100
cho S= 3/1.4 cong 3/4.7 cong 3/7.10 cong . . . cong 3/40.43 cong 3/ 43.46 .Hay chung to rang Slon hon 1
Cho A bang 1 phan 11 cong 1 phan 12 cong 1 phan 13 cong......cong 1 phan 39 cong 1 phan 40
Chung minh A lon hon 3 phan 4
Cho 3 so nguyen p ; p cong 2014.k;p cong 2015.k la cac so nguyen to lon hon 3 va p chia cho 3 du 1.Chung minh rang k chia het cho 6
5 mu n nhan 5 mu n cong 1 nhan 5 mu n cong 2 be hon hoac bang 10 mu 18
chung to rang tong sau co gia tri la 1 so chinh phuong
1mu3 cong 2 mua3 cong .....cong 10 mu3
1/2 cong 1/ 3 cong ... cong 1/2 mu 1999 chung minh m > 1000
giúp mk với nhé
cảm ơn mn
mot nha may co 3 phan xuong . so cong nhan cua phan xuong 1 bang 36% tong so cong nhan nha may so cong nhan cua phan xuong 2 bang 3/5 so cong nhan cua phan xuong 3 . biet so cong nhan cua phan xuong 3 hon so cong nhan cua phan xuong 1 la 18 nguoi . tinh so nguoi moi phan xuong
1 CONG 3 CONG 5 CONG CONG .......... CONG [ 2x X CONG 1] =169
