Giải phương trình sau :
X-3/2011+x-2/2012=x-2012/2+x-2011/3
Giúp giùm mình với ..............
Giải phương trình : (x-3/2011)+(x-2/2012)=(x-2012/2)+(x-2011/3)
x - 3/2011 + x - 2/2012 = x - 2012/2 + x - 2011/3
( x - 3 -2011)/2011 + (x - 2-2012)/2012 = (x - 2012-2)/2 + (x - 2011-3)/3
(x-2014)/2011+(x-2014)/2012=(x-2014)/2+(x-2014)/3
(x-2014)(1/2011+1/2012-1/2-1/3)=0
x-2014=0 vì (1/2011+1/2012-1/2-1/3 khác 0
x= 2014
k cho mk nha
Giải phương trình:
x-3/2011+x-2/2012=x-2012/2+x-2011/3
(x-3/2011)-1+(x-2/2012)-1 = (x-2012/2)-1+(x-2011/3)-1
x-2014/2011+x-2014/2012 = x-2014/2+x-2014/ 3
(x-2014)(1/2011+1/2012-1/2-1/3)=0
x-2014 =0 [vì (1/2011+ 1/2012-1/2-1/3#0)]
x=2014
\(\Leftrightarrow\frac{4023x-10058}{4046132}=\frac{5x-10056}{6}\Rightarrow\left(4023x-10058\right)6=4046132\left(5x-10058\right)\)
<=>(4023x-10058)6=6(4023x-10058)
=>6(4023x-10058)=4046132(5x-10058)
=>24138x-60348=20230660x-40695995656
=>-20206522x=-40695935308
=>x=(-40695935308):(-20206522)
=>x=2014
Giải phương trình
\(\frac{x-3}{2011}+\frac{x-2}{2012}=\frac{x-2012}{2}+\frac{x-2011}{3}\)
Ta có:\(\frac{x-3}{2011}+\frac{x-2}{2012}=\frac{x-2012}{2}+\frac{x-2011}{3}\)
\(\Rightarrow\left(\frac{x-3}{2011}-1\right)+\left(\frac{x-2}{2012}-1\right)=\left(\frac{x-2012}{2}-1\right)+\left(\frac{x-2011}{3}-1\right)\)
\(\Rightarrow\frac{x-2014}{2011}+\frac{x-2014}{2012}=\frac{x-2014}{2}+\frac{x-2014}{3}\)
\(\Rightarrow\frac{x-2014}{2011}+\frac{x-2014}{2012}-\frac{x-2014}{2}-\frac{x-2014}{3}=0\)
\(\Rightarrow\left(x-2014\right).\left(\frac{1}{2011}+\frac{1}{2012}-\frac{1}{2}-\frac{1}{3}\right)\)
\(\Rightarrow x-2014=0\)( vì \(\frac{1}{2011}+\frac{1}{2012}-\frac{1}{2}-\frac{1}{3}\ne0\))
\(\Rightarrow x=2014\)
Vậy x= 2014.
Giải phương trình:\(\frac{x-3}{2011}+\frac{x-2}{2012}=\frac{x-2012}{2}+\frac{x-2011}{3}\)
\(\frac{x-3}{2011}+\frac{x-2}{2012}=\frac{x-2012}{2}+\frac{x-2011}{3}\)
\(\Rightarrow\left(\frac{x-3}{2011}-1\right)+\left(\frac{x-2}{2012}-1\right)=\left(\frac{x-2012}{2}-1\right)+\left(\frac{x-2011}{3}-1\right)\)
\(\Rightarrow\frac{x-2014}{2011}+\frac{x-2014}{2012}=\frac{x-2014}{2}+\frac{x-2014}{3}\)
\(\Rightarrow x=0\)
\(\frac{x-3}{2011}+\frac{x-2}{2012}=\frac{x-2012}{2}+\frac{x-2011}{3}\)
\(\Leftrightarrow\frac{x-3}{2011}-1+\frac{x-2}{2012}-1=\frac{x-2012}{2}-1+\frac{x-2011}{3}-1\)
\(\Leftrightarrow\frac{x-2014}{2011}+\frac{x-2014}{2012}-\frac{x-2014}{2}-\frac{x-2014}{3}=0\)
\(\left(x-2014\right)\left(\frac{1}{2011}+\frac{1}{2012}-\frac{1}{2}-\frac{1}{3}\right)=0\)
Vì : \(\frac{1}{2011}+\frac{1}{2012}-\frac{1}{2}-\frac{1}{3}\) < 0
=> x-2014 =0
\(\Leftrightarrow x=2014\)
giải bất phương trình:
\(\frac{x-3}{2011}+\frac{x-2}{2012}\ge\frac{x-2012}{2}+\frac{x-2011}{3}\)
Mình có bài hay lắm nè
a, tìm x biết :1/1x2+1/3x5+1/5x8+......+1/x(x+2)= 1005/2011
b, so sánh 2011/2012+2012/2013+2013/2011 và 3
giải giùm mình nha !
Câu 1 bị sai đề bài.
Câu 2:
\(\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2011}=\frac{2012-1}{2012}+\frac{2013-1}{2013}+\frac{2011+1+1}{2011}\)
\(=1-\frac{1}{2012}+1-\frac{1}{2013}+1+\frac{1}{2011}+\frac{1}{2011}\)
Vì:
\(\frac{1}{2011}>\frac{1}{2012};\frac{1}{2011}>\frac{1}{2013}\Rightarrow\frac{1}{2011}+\frac{1}{2011}-\frac{1}{2012}-\frac{1}{2013}>0\)
\(\Rightarrow\)\(\frac{2012-1}{2012}+\frac{2013-1}{2013}+\frac{2011+1+1}{2011}>3\)
\(\Rightarrow\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2011}>3\)
Tính 2 mũ76 - 2 mũ 74/ 2 mũ 78- 2 mũ 76
bài này khó lắm đó
Giải phương trình : \(\frac{x-3}{2011}+\frac{x-2}{2012}=\frac{x-2012}{2}+\frac{x-2011}{3}\)
Trừ 2 vế đi 2 đơn vị : (x-3-2011)/2011 + (x-2-2012)/2012= (x-2012-2)/2 +(x-2011-3)/3
Đổi vê chuyển dấu, đặt tử là x-2014 ra ngoài: (x-2014)(1/2011+1/2012-1/2-1/3)=0
Vì 1/2011+1/2012-1/2-1/3 khác 0 nên x-2014=0
Hay x=2014
giải phương trình: \(\frac{x-1}{2012}+\frac{x-2}{2011}+\frac{x+3}{2010}+...+\frac{x-2012}{1}=2012\)
Ta có :
\(\frac{x-1}{2012}+\frac{x-2}{2011}+\frac{x-3}{2010}+...+\frac{x-2012}{1}=2012\)
\(\Leftrightarrow\)\(\left(\frac{x-1}{2012}-1\right)+\left(\frac{x-2}{2011}-1\right)+\left(\frac{x-3}{2010}-1\right)+...+\left(\frac{x-2012}{1}-1\right)=2012\)
\(\Leftrightarrow\)\(\frac{x-1-2012}{2012}+\frac{x-2-2011}{2011}+\frac{x-3-2010}{2010}+...+\frac{x-2012-1}{1}=0\)
\(\Leftrightarrow\)\(\frac{x-2013}{2012}+\frac{x-2013}{2011}+\frac{x-2013}{2010}+...+\frac{x-2013}{1}=0\)
\(\Leftrightarrow\)\(\left(x-2013\right)\left(\frac{1}{2012}+\frac{1}{2011}+\frac{1}{2010}+...+\frac{1}{1}\right)=0\)
Vì \(\frac{1}{2012}+\frac{1}{2011}+\frac{1}{2010}+...+\frac{1}{1}\ne0\)
Nên \(x-2013=0\)
\(\Leftrightarrow\)\(x=2013\)
Vậy \(x=2013\)
Chúc bạn học tốt ~
\(\frac{x-1}{2012}-1+\frac{x-2}{2011}-1+...+\frac{x-2012}{1}-1+2012=2012\)
\(\Leftrightarrow\frac{x-2013}{2012}+\frac{x-2013}{2011}+...+\frac{x-2013}{1}=0\)
\(\Leftrightarrow\left(x-2013\right)\left(\frac{1}{2012}+\frac{1}{2011}+\frac{1}{2010}+...+\frac{1}{1}\right)=0\)
\(\Leftrightarrow x=2013\)
Giải phương trình \(\frac{x-1}{2012}+\frac{x-2}{2011}+\frac{x-3}{2010}+................+\frac{x-2012}{1}=2012\)
Giúp mik nha ai nhanh nhất mik tik
\(\Leftrightarrow\left(\frac{x-1}{2012}-1\right)+\left(\frac{x-2}{2011}-1\right)+...+\left(\frac{x-2012}{1}-1\right)=0\)
\(\Leftrightarrow\frac{x-2013}{2012}+\frac{x-2013}{2011}+...+\frac{x-2013}{1}=0\)
\(\Leftrightarrow\left(x-2013\right)\left(\frac{1}{2012}+\frac{1}{2011}+....+1\right)=0\)
\(\Leftrightarrow x-2013=0\)(because 1/2012 +1/2011+...+1 luôn lớn hơn 0
\(\Leftrightarrow x=2013\)
Vậy ........