(1 + 5 mu 2 + 5 mu 4 + 5 mu 6 + 5 mu 8)*x = 5 + 5 mu 2 + 5 mu 3 + 5 mu 4 +....+ 5 mu 10
B=1/3+1/3 mu 3 +1/3 mu 5 +1/3 mu 7 + ...+1/3 mu 99
M= 3/1 mu 2 . 2 mu 2 +5/2 mu 2 . 3 mu 2+7/3 mu 2 . 4 mu 2 + ...+19= 9 mu 2 . 10 mu 2
Tìm X biết :
x - 5 = 7 mu 10 :7 mu 8 + 2 mu 2018 nhan ( 2 mu 4 - 4 mu 2)
Tính A= 2 mu 10 -2 mu 9 - 2 mu 8 - .... - 2 mu 2 - 2 -1
7 nhan 6 mũ 10 nhan 2 mu 20 nhan 3 mu 6-2 mu 19 nhan 6 mu 15 phần 9 nhân 6 mu 19 nhan 2 mu 9 -4 nhan 3 mu 17 nhan 2 mu 26
6 mu 5 nhan 2 mu 7 tren 3 mu 4 nhan 2 mu 10
chung minh 3 mu n+2 - 2 mu n+2 +3 mu n - 2 mu n chia het cho 10
(3.4.2 mu 16) tat ca mu 2/11.2 mu 13 .4 mu 11-16 mu 10
80 mu 10 :(3x-7 mu 2)=80 mu 9