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2x + 23 = 2012 - ( 2012 - 15 )
2x + 23 = 2012 - 2012 + 15
2x + 23 = 15
2x = -8
x = -4
2x + 23 = 2012 - (2012 - 15)
2x + 23 = 2012 - 2012 + 15
2x + 23 = 0 + 15
2x + 23 = 15
2x = -8
x = -4
2x+23=2012-(2012-15)
2x+23=2012-2012+15
2x+23=15
2x=15-23
2x=-8
2x=-8:2
x=-4
a) Ta có:
3x + 2012 = 2015
3x = 2015 - 2012
3x = 3
x = 3 : 3
x = 1
Vậy x = 1
b) Ta có:
5x - 12 = 32 .52
5x - 12 = 468
5x = 480
x = 96
Vậy x = 96
c) Ta có:
2012 - (2013 - x) = 12
2013 - x = 2000
x = 13
Vậy x = 13
d) Ta có:
2002 : [12+(2x-20)] = 91
12+(2x-20) = 22
2x-20 = 10
2x = 30
x = 15
Vậy x = 15
P=1+2012 +20122+20123+20124+...+201271+201272
2012P=2012(1+2012 +20122+20123+20124+...+201271+201272)
2012P=2012 +20122+20123+20124+...+201272+201273
2012P-P= (2012 +20122+20123+20124+...+201272+201273) - ( 1+2012 +20122+20123+20124+...+201271+201272 )
2011P=201273-1
P=(201273-1)/2011
Vì (201273-1)/2011< 201273-1 nên P<Q
NHỚ NHA!!!!!!
P=1+2012 +20122+20123+20124+...+201271+201272
2012P=2012(1+2012 +20122+20123+20124+...+201271+201272)
2012P=2012 +20122+20123+20124+...+201272+201273
2012P-P= (2012 +20122+20123+20124+...+201272+201273) - ( 1+2012 +20122+20123+20124+...+201271+201272 )
2011P=201273-1
P=(201273-1)/2011
Vì (201273-1)/2011< 201273-1 nên P<Q
NHỚ NHA!!!!!!
a) \(6x-36=5^{12}:5^{10}-2012^0\)
\(6x-36=5^2-2012^0\)
\(6x-36=25-1\)
\(6x-36=24\)
\(6x\) \(=24+36\)
\(6x\) \(=60\)
\(x=60:6\)
\(x=10\)
Vậy \(x=10\)
b) \(2x-125=-65\)
\(2x\) \(=\left(-65\right)+125\)
\(2x\) \(=60\)
\(x=60:2\)
\(x=30\)
Vậy \(x=30\)
c) \(2012-120\left(4x+1\right)=932\)
\(120\left(4x+1\right)=2012-932\)
\(120\left(4x+1\right)=1080\)
\(4x+1=1080:120\)
\(4x+1=9\)
\(4x\) \(=9-1\)
\(4x\) \(=8\)
\(x=8:4\)
\(x=2\)
Vậy \(x=2\)
a) 6x - 36 = 512 : 510 - 20120
6x - 36 = 52 - 20120
6x - 36 = 25 - 1
6x - 36 = 24
6x = 24 + 36
6x = 60
x = 60 : 6
x = 10
Vậy x = 10
b) 2x - 125 = -65
2x = (-65) + 125
2x = 60
x = 60 : 2
x = 30
Vậy x = 30
c) 2012 - 120(4x + 1) = 932
120(4x + 1) = 2012 - 932
120(4x + 1) = 1080
4x + 1 = 1080 : 120
4x + 1 = 9
4x = 9 - 1
4x = 8
x = 8 : 4
x = 2
Vậy x = 2.
Chúc bạn học tốt!
\(\Leftrightarrow\)2x+234=2012-2012+15x
\(\Leftrightarrow\)2x-15x=-234
\(\Leftrightarrow\)-13x=-234
\(\Leftrightarrow\)x=18
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