Các câu hỏi tương tự
Tính :
A = 1 . 2 + 2 . 3 + 3 . 4 + ... + 99 . 100
B = 1 . 3 + 2 . 4 + 3 . 5 + ... + 99 . 100
C = 1 . 4 + 2 . 5 + 3 . 6 + ... + 99 . 102
D = 4 + 12 + 24 + ... + 19404 + 19800
E = 1 + 3 + 6 + 10 + ... + 4851 + 4950
-1-2-3-4-5-.......-100
-2-4-6-8-....-100
-6-9-12-15-......-99
-1+2-3+4-5+6-......-99+100
4-8+12-16+...........+196-200
Tính:
M=(1-1/2^2).(1-1/3^2).(1-1/4^2)...(1-1/49^2).(1-1/50^2)
N=(3/2-2/2^2).(4/3-2/3^2).(5/4-2/4^2)...(100/99-2/99^2).(101/100-2/100^2)
Tính nhanh
a, 1-2+3-4+.....+2015-2016+2017
b,1+3-5-7+9+11+....+97-98-99+100+101
c,1-2-3+4+5-6-7+....+97-98-99+100+101
d,2^100-2^99-2^98-....-2-1
Nhanh nha m dang cần gấp
Cho A=2×9×8+3×12×10+4×15×12+...+98×297×200/23×4+3×4×5+4×5×6+..+98×99×100
Tính a2
Bài 4: Tính tổng 1) 1 + (-2) + 3 + (-4) + . . . + 19 + (-20) 2) 1 – 2 + 3 – 4 + . . . + 99 – 100 3) 2 – 4 + 6 – 8 + . . . + 48 – 50 4) – 1 + 3 – 5 + 7 - . . . . + 97 – 99 5) 1 + 2 – 3 – 4 + ... + 97 + 98 – 99 - 100
Tính:
a, A =\(\frac{101+100+99+98+...+3+2+1}{101-100+99-98+...+3-2+1}\)
b, B = \(\frac{3737.43-4343.37}{2+4+6+...+100}\)
c, D = \(\frac{2^{12}.13+2^{12}.65}{2^{10}.104}+\frac{3^{10}.11+3^{10}.5}{3^9.2^4}\)
(Các bn giải chi tiết giúp mik nha)
Tính nhanh
a) 1 + 2 + 3 + … + 99 + 100 b) 2 + 4 + 6 + … + 96 + 98
c) (–1) + 2 + (–3) + 4 + … + (–99) +100 d) –1 + 2 – 3 + 4 – … – 99 + 100
Tính nhanh
a)A = 1 + 1/2 +1/4 + .......+ 1/2^99 +1/2^100+1/2^100
b) 12/56 + 12/140+12/260 +.....+ 12/1400