đặt A=1+2+\(2^2\)+........+\(2^{63}\)thì 2A=2+22+\(2^3\)+.......+\(2^{64}\)
suy ra 2A-A=\(2^{64}\)-1 hay A=\(2^{64}\)-1
vậy D=\(2^{64}\)-A=\(2^{64}\)-\(2^{64}\)+1=1
tinh nhanh gia tri bieu thuc 1/2+ 1/22
TINH GIA TRI BIEU THUC ko tim n tinh bieu thuc
125.(-61):(-2)^3:(-1)^2n (nTHUOC N*)
CHO bieu thuc
B=17,58*43+57*17,58/293*A
a)tim gia tri cua bieu thuc Bkhi a=2
b)tinh gia tri a khi B=2
c)tim gia tri so tu nhien ad biet bieu thuc B co gia tri lon nhat ,gia tri lon do la bao nhieu
Tinh gia tri cua bieu thuc (-1+2/5).(-1+/2/9).(-1+2/9).............(-1+2/2013)
tinh gia tri bieu thuc B =1^2/2^2-1.3^2/4^2-1....2013^2/2014^2-1
Tinh gia tri cua bieu thuc : A =1+1/2+1/2^2+1/2^3+...+1/2^2014
Tinh gia tri bieu thuc: A=2/2.5+2/5.8+............+2/95.98
tim cac dang cua x sao cho
bieu thuc A = 2x-1 co gia tri duong x
bieu thuc B = 8-2x co gia tri am
bieu thuc C=2(x+3) khong am
bieu thuc D=7(2-x)khong duong
tinh gia tri bieu thuc sau : A=1+2+3+...+2015
