Ko tinh ,hay so sanh
A=988*988
B=986*990
Cho A=1993*427 va B=986*990.Tinh hieu B-A ma ko can tinh rieng tich A,B.
So sánh
A = \(\frac{976}{987}+\frac{987}{988}\)B=\(\frac{986+987}{987+988}\)
A = \(\frac{976}{987}\) + \(\frac{987}{988}\) = \(1,987842971\)
B = \(\frac{986+987}{987+988}\)= \(\frac{1973}{1975}\) = \(0,9989873418\)
Mà \(1,987842971\)> \(0,9989873418\)
Nên: A > B
Ta có: \(\frac{986}{987}>\frac{986}{987+988}\)
\(\frac{987}{988}>\frac{987}{987+988}\)
\(\Rightarrow\frac{976}{987}+\frac{987}{988}>\frac{986+987}{987+988}\)
=> A > B
Ko tinh biểu thức hay so sanh
A=31.82 Va B=30.81+111
A>B
Vi 31.82=2542
30.81+111=2541
Nen suy ra A>B
k cho minh nha
ko tinh cu the, hay so sanh a va b biet
a = 2002 x 2002
b = 2002 x 2004
a = 2002 x 2002
b = 2002 x 2004
Vì 2002<2004 vậy a<b
Vì 2002 = 2002
Mà 2002 < 2004
=> 2002.2002 < 2002.2004
a = 2002 x 2002
b = 2002 x 2004
=> a < b
*******************************
ko tinh cu the hay so sanh 2003.2007 va 2005^2; 2014.2016 va 2015^2
ko tinh gia tri cu thr hay so sanh bieu thuc
a)A=199x201 va B=200x200
b)C=35x53-8 va D=35+53x34
Tính A biết : A=2-3-4+5+6+7-8-9-10+...-987-988-989+990+991+992
ko thuc hien phep tinh hay so sanh cac tong sau
5a+a5...............aa+55
tra loi nhanh cho minh cai
Tinh A= 2014/2015+2015/2016+2016/2017+2017/2014 hay so sanh A voi 4
=(2014/2014)+(2015+2015)+(2016/2016)+(2017+2017)
=1+1+1+1
=4
vậy A=4 (4=4)