Tính nhanh:
a) 54.4034-2014.( 20153+20152+2016)
b) 10013 - 9993- 6.10002
Tính nhanh:
a) 99 3 ; b) 91 3 + 3 . 91 2 . 9 + 3 . 91 . 9 2 + 9 3 ;
c) 1001 3 ; d) 102 3 – 6 . 102 2 + 12.102 – 8.
a) ( 100 – 1 ) 3 = 970299. b) ( 91 + 9 ) 3 = 100 3 .
c) ( 1000 + 1 ) 3 = 1003003001. d) ( 102 – 2 ) 3 = 100 3 .
1,Tính nhanh
[2015*2015*2014-2014-2014*2015]*[2016*2016+2015*2015*2016]
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
\(201^2=\left(200+1\right)^2=200^2+2.200.1+1^2=40000+400+1=40401\)
\(498^2=\left(500-2\right)^2=500^2-2.500.2+2^2=250000-2000+4=248004\)
\(93.107=\left(100-7\right)\left(100+7\right)=100^2-7^2=10000-49=9951\)
\(2016^2-2015.2017=2016^2-\left(2016-1\right)\left(2016+1\right)=2016^2-2016^2+1^2=1\)
Tính A/B biết
A= 1/2+1/3+1/4+.....+1/2019
B = 2016/1+2015/2+2014/3+....+1/2016
Ai nhanh mik cho 3 tick
Tính nhanh: 2014 x 2014 + 2016 x 2012
\(2014^2+\left(2014+2\right)\left(2014-2\right)=2014^2+2014^2-4=2\times2014^2-4\)
2014 x2014+2016 x 2012
=2014+2016 x 2012
=(2014+2016) x 2012
=2012 x 4036
????????
ah hihihi do ngoc
Tính nhanh: 2014 x 2014 + 2016 x 2012
Ai trả lời nhanh nhất, đúng & đầy đủ thì mk sẽ
So sánh A = \(\dfrac{10^{2014}+2016}{10^{2015}+2016}\) và B = \(\dfrac{10^{2015}+2016}{10^{2016}+2016}\) giúp mình nhanh với
\(10A=\dfrac{10^{2015}+2016+9\cdot2016}{10^{2015}+2016}=1+\dfrac{18144}{10^{2015}+2016}\)
\(10B=\dfrac{10^{2016}+9+18144}{10^{2016}+2016}=1+\dfrac{18144}{10^{2016}+2016}\)
mà \(\dfrac{18144}{10^{2015}+2016}>\dfrac{18144}{10^{2016}+2016}\)
nên A>B
Tính nhanh (2014*2015-2016) : (2012+2013*2014)
bằng 1 thưa bạn
=(2014*2013 +2014+2014-2016) : (2012 +2013*2014)
=(2014*2013 +2012):(2012+2013*2014)
tính nhanh nếu có thể :
2014 . 2015 + 2014
------------------------------- =
2014 . 2016 - 1000
\(\frac{2014\cdot2015+2014}{2014\cdot2016-1000}\)
\(=\frac{2014\cdot2015+2014}{2014\cdot\left(2015+1\right)-1000}\)
\(=\frac{2014\cdot2015+2014}{2014\cdot2015+2014\cdot1-1000}\)
\(=\frac{2014\cdot2015+2014}{2014\cdot2015+1014}\)
\(=\frac{2014}{1014}=.......\)
2014.2015 + 2014 = 4028.2015
2014.2016 - 1000 = 1014.2016
Tính nhanh
a) A=1+2-3-4+5+6-7-8+9+10-...+2013+2014-2015-2016
b) B=2-4+6-8+..-2000+2002