A=99-(1/2 + 1/3+1/4+...+1/100) : (1/2+2/3+3/4+...+99/100)
tinh gia tri cua A.
TINH GIA TRI CUA BIEU THUC
a: A=100-99+98-97....+4 -3 +2=.......
b:B =1+1+1+.......+1 -999(CO 1000 SO 1)=.......
tinh tong gia tri bieu thuc :
a)A=1+1/3+1/5+...+1/97+1/99/1/1*99+1/3*97+1/5*95+...+1/97*3+1/99*1
b)B=1/2+1/3+1/4+...+1/100/99/1+98/2+97/3+...+1/99
tinh gia tri bieu thuc : a ) : (1+2+3+4+ .............+97+98+99+100) : 5
Tổng các số trong trong ngoặc là:(100+1).[(100-1):1+1]:2=5050
a=5050:5=1010
gia tri cua bieu thuc
1-2+3-4+...+99-100
co ai bit hom tra loi giup mik nha mik dg rat can
số số hạng là 100 số
số cặp là 100 : 2= 50 cặp
giá trị 1 cặp là 0-1=-1
giá trị của biểu thức là -1 * 50= -50
tick cho tớ
cho bieu thuc a=-1/3+1/3^2-1/3^3+1/3^4-1/3^5+...+1/3^100 tinh gia tri cua bieu thuc b=4/a/+1/3^100
Tinh gia tri bieu thuc
1+ 1+ 1+.................................... +1
(1*2)+(2*3)+(3*4).................................+(99*100)
tim gia tri cua bieu thuc
A=1-2-3-4+5-6-7-8+9-10-11-12+...........+97+98-99-100
tinh gia tri bieu thuc [1+1/100] * [1+1/99]*.....* [1+1/3] * [1+1/2]
Ta có : \(\left(1+\frac{1}{100}\right).\left(1+\frac{1}{99}\right).......\left(1+\frac{1}{3}\right)\left(1+\frac{1}{2}\right)\)
\(=\frac{101}{100}.\frac{100}{99}.\frac{99}{98}......\frac{4}{3}.\frac{3}{2}=\frac{101}{2}\)
\(\left(1+\frac{1}{100}\right).\left(1+\frac{1}{99}\right).....\left(1+\frac{1}{3}\right).\left(1+\frac{1}{2}\right)\)
\(=\frac{101}{100}.\frac{100}{99}.....\frac{4}{3}.\frac{3}{2}=\frac{101}{2}\)
Đặt \(A=\left[1+\frac{1}{100}\right]\cdot\left[1+\frac{1}{99}\right]\cdot....\cdot\left[1+\frac{1}{3}\right]\cdot\left[1+\frac{1}{2}\right]\)
\(A=\frac{101}{100}\cdot\frac{100}{99}\cdot....\cdot\frac{4}{3}\cdot\frac{3}{2}\)
\(A=\frac{101}{\frac{4}{2}}=\frac{101}{2}\)
C=1/1*2+1/3*4+....+1/99*100
D=1/51*100+1/52*99+.....+1/100*51
chung minh c:d ko co gia tri la so tu nhien