1+1+1+1+1+1+1=......
ai lam nhanh to tich cho
1+1+1+1=.......
AI LAM NHANH TO TICH CHO
1+1+1+1+1=......
ai lam nhanh to tich cho
1+1+1+1+1=..........
ai lam nhanh to tich cho
1+1+1+1+1=5 ks nha mình trả lời đầu tiên nè
\(A=\frac{1}{21}+\frac{1}{2.22}+.......\frac{1}{1993.2013}\)
ai lam nhanh to tich cho
( x +1 ) + ( x +2) + ..............+(x+100) = 5750
ai lam nhanh to tich cho
Ta có: (x+1)+(x+2)+....+(x+100) = 5750
=> (x+x+x+...+x) + (1+2+3+3+.....+100) = 5750
=> 100x + 5050 = 5750
=> 100x = 5750 - 5050 = 700
=> x = 700:100
=> x = 7
Vậy x = 7
(x+1)+(x+2)+(x+3)+...+(x+100)=5750
x + 1 + x + 2 + x + 3 + .... + x + 100 = 5750
(x + x + x + ... + x) + (1 + 2 + 3 + ... + 100) = 5750
100x + 5050 = 5750
100x = 5750 - 5050 = 700
x = 700 : 100 = 7
( x + 1) + ( x + 2) + ... + (x + 100) = 5750
(x + x + x + ... + x ) + (1 + 2 + ... + 100) = 5750
100x + (1 + 2 + ... + 100) = 5750
100x + 5050 = 5750
100x = 5750 - 5050
100x = 700
x = 7
\(B=1^2+2^2+...........+100^2\)
ai lam nhanh to tich cho 3 lan
1+1+1+1+1+5+9+7x0=
ai lam nhanh va dung minh tich
1 + 1 + 1 + 1 + 1 + 5 + 9 + 7 x 0
= 5 x 1 + 5 + 9 + 0
= 5 + 5 + 9 + 0
= 19
= 0 vì bất kì số nào nhân vơi 0 cung bằng 0
Chung to A = 1 x 2 + 2 x 3 + 3 x 4 + ..... + n x [ n + 1 ] = {[n x [ n + 1 ] x [ n + 2 ] }/3 , n > 0
Cac ban nhanh len nhe ngay mai minh phai nop roi . Ai lam nhanh , dung dau tien minh cho 1 tich
-1+3-5+7-9+.....-209+2011-2013
co phan loi giai
ai lam nhanh to tich cho