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\(\frac{A}{B}=\frac{2010+2011\times2012}{2012\times2013-2014}\)
B = 2012 x 2013 - 2014 = 2012 x (2011+2) - 2014 = 2012 x 2011 + 2012 x 2 - 2014 = 2012 x 2011 + 2010 = 2010 + 2011 x 2012
Thay B vào biểu thức tính thương, ta được:
\(\frac{A}{B}=1\)
Đáp số: 1
Nếu mình giúp đc bạn, thì cho mình nhé!
Bài giải
Ta có:
2010 + 2011 x 2012 /2012 x 2013 – 2014
= ( 2010 + 2011 x 2012) / (2012 x (2011 + 2) – 2014)
= ( 2010 + 2011 x 2012) / (2012 x 2011) + ((2012 x2 ) – 2014)
= ( 2010 + 2011 x 2012) / (2012 x 2011) + 2010
= 1/1
= 1
nhin vao de la bik = 1 rui ko can phai lam dai dong vay dau
\(\frac{2}{5}\cdot\frac{1}{2}-\frac{2}{5}\cdot\frac{1}{3}-\frac{2}{5}\cdot\frac{1}{6}\)
\(=\frac{2}{5}\cdot\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(=\frac{2}{5}\cdot\frac{0}{6}=\frac{2}{5}\cdot0=0\)
tìm x
a) \(0,5+\left(x-\frac{15}{2}\right):\frac{1}{2}=\frac{9}{2}\)
\(\Rightarrow x=\frac{19}{2}=8,5\)
b) \(2012\cdot x-2010\cdot x=2014\)
\(\Leftrightarrow\left(2012-1010\right)\cdot x=2014\)
\(\Leftrightarrow2x=2014\)
\(\Rightarrow x=\frac{2014}{2}=1007\)
hok tốt .
Tính nhanh:
2/5 x 1/2 - 2/5 x 1/3 - 2/5 x 1/6
= 2/5 x ( 1/2 - 1/3 - 1/6 )
= 2/5 x ( 3/6 - 2/6 - 1/6 )
= 2/5 x 0/6
=0
a) \(\frac{47}{32}>\frac{36}{46}\)Vì phân số \(\frac{47}{32}>1;\frac{36}{46}< 1\)nên \(\frac{47}{32}>\frac{36}{46}\)
b) \(\frac{199}{200}< \frac{200}{201}\)Vì \(\frac{199}{200}=\frac{199.201}{200.201};\frac{200}{201}=\frac{200.200}{201.200}\)
ta so sánh 199.201 và 200.200
199.201 = 199.(200+1) = 199.200+199
200.200 = 200.(199+1) = 200.199+200
Vì 199.200 + 199 < 200.199+200 nên \(\frac{199}{200}< \frac{200}{201}\)
c) \(\frac{2012.2010}{2011.2011}=\frac{\left(2011+1\right).2010}{2011.\left(2010+1\right)}=\frac{2011.2010+2010}{2011.2010+2011}\)
\(\frac{2013.2009}{2014.2008}=\frac{2013.\left(2008+1\right)}{\left(2013+1\right).2008}=\frac{2013.2008+2013}{2013.2008+2008}\)
ta so sánh : \(\frac{2010}{2011}< \frac{2013}{2008}\) vì \(\frac{2010}{2011}< 1;\frac{2013}{2008}>1\)
a)(3/2-0,5)/x=7/2+1/4
(3/2-1/2)/x=14/4+1/4
1/x=15/4
x=1:15/4
x=4/15
b)(x*0,25+2010)*2011=(53+2010)*(2012-1)
(x*0,25+2010)*2011=2063*2011
=>0,25x+2010=2063
0,25x=2063-2010
0,25x=53
x=53/0,25
x=212
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}$
y x 2012 - y = 2012 x 2010 + 2012
2011 x y = 4046132
y = 4046132 : 2011
y = 2012
vậy y = 2012
cbht
Ta có:
y x 2012 - y = 2012 x 2010 + 2012
y*2012 - y*1=2012*2010+2012*1
y*(2012- 1)=2012*(2010+1)
y*2011=2012*2011
y=2012(bớt mỗi vế 1 thừa số 2011)
Vậy y=2012
X x ( 2012 - 2010 ) = 2014
X x 2 = 2014
X = 2014 : 2
X = 1007
nhớ kick nha hok tok