ổng 5 - ( -47 + 37 - 16)5−(−47+37−16) bằng:
A. 5 + 47 - 37 + 16.5+47−37+16.
B. 5 - 47 + 37 - 16.5−47+37−16.
C. 5 + 47 + 37 - 16.5+47+37−16.
D. 5 + 47 + 37 + 16.5+47+37+16.
cho A = 6+16+162+163+164+165+166+167+168+169. Chứng tỏ rằng A vừa chia hết cho 2, vừa chia hết cho 5
5/11*16+5/16*21+5/21*26+...+5/61*66
R = 5 / 11 * 16 + 5 / 16 * 21 + ...+ 5 / 61 * 66
24.(16-5)-16.(24-5)
24.(16-5)-16.(24-5)
Tính A = 5/11*16 +5/16*21 +5/21*26 +....+5/61*66
a = 5/11*16 + 5 / 16 *21 + 5/ 21*26 + 5/ 26 *31 +5/ 31*36 + 5/ 36 *41
16*17-5trên 16*16+5
( 16 . 17 - 5 ) : ( 16 . 16 +1 )