S = 22 + 42 + 62 + ... + 202
S = 22.(12 + 22 + 32 + ... + 102)
S = 4.385
S = 1540
lấy máy tính tính ra: 12 + 22 + ... + 102 = 385
3 mu 6 chia 3 mu 2 cong 2 mu 3 nhan 2 mu 2
Cho tam giac ABC CMR neu ha=3,hb=4,hc=5 thi a mu 2 lon hon b mu 2 cong c mu 2
tim chu so tan cung cua 4 mu 205 cong voi 7 mu 43
1 thang mu di voi 3 thang mu vao 1quan pho .ma moi to pho co gia 10.000 d ..hoi tong cong phai tra bao nhieu tien
Cm 1/2 mu 2 - 1/ 2mu 4 + 1/ 2 mu 6-...-1/2mu 4n -2 -1/2 mu 4n + ...+ 1/ 2 mu 2014 - 1/ 2 mu 2016 < 0,2
Cm 1/2 mu 2 - 1/ 2mu 4 + 1/ 2 mu 6-...-1/2mu 4n -2 -1/2 mu 4n + ...+ 1/ 2 mu 2014 - 1/ 2 mu 2016<0,2
so sanh 2 mu 36 va 3 mu 27
9 mu 20 va 9999 mu 10
54 mu 4 va 21 mu 12
cac bn giup mk nka
rut gon a=4 mu 5. 9 mu 4 - 2 . 6mu 9/2 mu 10. 3 mu 8+ 6mu 8 .20
Cho S =1/5+2/5 mu 2 +3/5mu 3 +4/5 mu 4+....+2012/5 mu 2012
So sánh S với 1/3
