1/2 + 2/3 + 3/4 + 4/5 + 5/6 + 6/7 + 7/8 + 8/9 + ........+ 95/96 + 96/97 + 97/98 + 98/99 + 99/100 = ?
Kết quả phép tính : 1-2-3+4+5-6-7+8+9......-99+100
1-2-3-4+5-6-7-8+9-10-11-12+...................+97-98-99-100
1-2+3+4+5-6-7×8+9-10-11+12+...+97-98-99+100
Tính nhanh:
a)45 . 94 - 2 . 69/ 210 . 38 + 68 . 20
b)2100 - 299 + 298 - 297 +...+ 22 - 2
c)(1+1/3+1/5+...+1/99) : (1/1.99+1/3.97+...+1/99.1)
(dấu chấm là dấu nhân nha). Cảm ơn mn
Tính:
a) -5/7(14/5 - 7/10) : |-2/3| - 3/4(8/9 + 16/3) + 10/3(1/3 + 1/5)
b) 17/-26(1/6 - 5/3) : 17/13 - 20/3(2/5 - 1/4) + 2/3(6/5 - 9/2)
c) -8/9(9/8 - 3/2) + 5/4 : (5/2 - 15/4) - 3/4(10/9 - 8/3) : (-1/3)
d) 21/10 : (12/5 - 9/10) . (-4/7) - 3/2(1/6 - 7/12) + 1/5(3/2 - 1/4)
3^8*20^5-3^9*5^5*2^9/6^8*10^4-3^8-2^9*5^4
Giúp mình với chiều nay mình nộp rồi
B= 1 - 2 - 3 +4 + 5 -6 -7 + 8 -... -99+100
tính tổng:
1+2+3-4-5-6+7+8+9-10-11-12+.....+97+98+99-100-101-102