Các câu hỏi tương tự
tinh tong
B= 9+99+999+.............+ 99...9 {99...9 là 50 chữ số 9 }
cho minh de thi mon toan so lop 7va giai giup
A=9+99+999+...+999999999999 =? k day
Tinh tong: a) 9 + 99 + 999 + ... + 999...999 ( co 10 c/s 9 )
b) Tim x, biet: 1/21 + 1/28 = 1/36 +... + 2/x(x+1) = 2 / 9
Tinh tong
a) D= 9+99+999+9999+...+999....9 (50 chu so 9)
b) E= 9+99+999+...+999...9 (200 chu so 9)
c)C=1−2^2+3^2−4^2+...+99^2−100^2
d) G= 1.1!+ 2. 2!+3.3!+ ... +100.100!
Tinh tong
a) D= 9+99+999+9999+...+999....9 (50 chu so 9)
b) E= 9+99+999+...+999...9 (200 chu so 9)
c) C=\(1-2^2+3^2-4^2+...+99^2-100^2\)
d) G= 1.1!+ 2. 2!+3.3!+ ... +100.100!
Tinh tong
a) D= 9+99+999+9999+...+999....9 (50 chu so 9)
b) E= 9+99+999+...+999...9 (200 chu so 9)
c) C=\(1-2^2+3^2-4^2+5^2-6^2+...+99^2-100^2\)
d) G= 1.1!+ 2. 2!+3.3!+ ... +100.100!
Tinh tong :
A = 9 + 99 + 999 +........+ 999 999 999 999
Cac ban lam on giup mink voi
Mink se k cho ban nao lam nhanh , dung , chi tiet nhat .
Thank you !
thu gon tong sau
9 +99+999+9999+...+999...9/100 chu so 9
TINH TONG
S=1+2+3+...+998+999
S=1+3+5+...+97+99