cho A = 2016 - 2014 + 2012 - 2010 + ......-1842
tính A
\(\text{cho A =2016-2014+2012-2010+....-1842.Tinh A}\)
Tính tổng A= 2016 - 2014 + 2012 - 2010 +...+ 20 -18 + 16 - 14
(6/2008*2010+6/2010*2012+6/2012*2014+6/2014*2016+6/2016*2018)+3/x=3/2008
bài 2: Tính nhanh
a) A = 201^2
b) B= 498^2
c) C= 93. 107
d) D= 2016^2 - 2015. 2017
e) E= 2016^3 - 1
________
2016^2 + 2017
g) G= 2016^2 - 2015^2 + 2014^2 - 2013^2 + 2012^2 - 2011^2 + 2010^2 - 1^2
\(201^2=\left(200+1\right)^2=200^2+2.200.1+1^2=40000+400+1=40401\)
\(498^2=\left(500-2\right)^2=500^2-2.500.2+2^2=250000-2000+4=248004\)
\(93.107=\left(100-7\right)\left(100+7\right)=100^2-7^2=10000-49=9951\)
\(2016^2-2015.2017=2016^2-\left(2016-1\right)\left(2016+1\right)=2016^2-2016^2+1^2=1\)
x^2016-x^2014+x^2012-x^2010+...+x^2-2016 tại x =2016, tính giá trị biểu thức
Tính nhanh: S= 4+(-5)+...+2010+(-2011)+2012+(-2013)+2014+(-2015)+2016
Cho A=2010+2011*2012;B=2012*20123-2014 .Tính A/B
A = 4 048 142
B = 4 048 142
A : B = 1
Duyệt nhé
Cho A=2010+2011*2012;B=2012*2013-2014.Tính A/B
Cho A=2010+2011*2012;B=2012*2013-2014 .Tính A/B.
\(\frac{A}{B}=\frac{2010+2011.2012}{2012.2013-2014}=\frac{2010+2011}{2013-2014}=\frac{4021}{-1}=-4021\)