(x-273)*1+(1+3+5+........+2015)=0
( x- 273 ) x ( 1+3 + 5 + ...... + 2015 ) =0
( x- 273 ) x ( 1+3 + 5 + ...... + 2015 ) =0
=> x = 273
vì số nào nhân với không cx bằng 0
mà 273 - 273 = 0 x ( 1 + 3 + 5 + ... + 2015 ) = 0
\(\left(x-273\right)\times\left(1+3+5+.....+2015\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-273=0\\1+3+5+.....+2015=0\left(vôly\right)\end{cases}}\)
\(\Rightarrow x-273=0\Rightarrow x=273\)
Ta có: \(\left(x-273\right).\left(1+3+5+...+2015\right)=0\)
=> 1 tích thế nào cùng bằng 0 mà (1+3+5+....+2015) VÌ các số này đều lớn hơn 0 nên (1+3+5+...+2015)
là số dương lớn hơn 0
=> x-273=0
=> x=273
Vậy x=273
(x-273)+(1+3+5....+2015)=0
( x - 273 ) + ( (1+2015) x 1008 : 2 ) ) = 0
x - 273 + 1016064 = 0
x= 273 + 1016064 + 0 = 1016337
(x - 273) + (1 + 3 + 5 + ... + 2015) = 0
(x - 273) + [(1 + 2015) x 1008 : 2] = 0
x - 273 + 1016064 = 0
x = 273 + 1016064 + 0
x = 1016337
Vậy x = 1016337
(x-273)=-(1+3+5+...+2015)
x-273=-2016.1008:2=1016064
x=1016064+273=1016337
bài 1 1/2+1/6+1/12+1/20+1/30+1/x=41/42
bài 2 (x-273)*(1+3+5....+2015)=0
Tìm x biết :
a) ( x - 273 ) * ( 1 + 3 + + 5 + ... + 2015 ) = 0
b) x/42= 156/42
c) 9/14 - x/7 : 5/3 = 3/14
d) 34/43=374/(x-32)
e) x +145/245 = 52/70
a, X = 273
b, X = 156
c, X = 4
d, X = 505
e, X = \(\frac{37}{245}\)
a) 2x-1/11+2x-2/12+2x-3/13=2x+5/5+2x+6/4+2x+7/3
b) x-1/2016+x-2/2015+x-3/2014+x-4/2013+x-5/2012 -5=0
c) x+2017/2+x+2015/3+x+2013/4+x+2011/5+8=0
2/5×(x-1)+1=3/5
(2/7×x+1)×(3-1/2×x)=0
5/4×x+1=1/2x+3/4
X-2020/10^2+x-202^0/10^3+x-2020/10^4=0
0x+1/2018+x+2/2017=x+3/2016-x+4/2015
2015
Nhanh tk nha
Hello bạn, mk cx tên Mai nek.
\(\frac{2}{5}.\left(x-1\right)+1=\frac{3}{5}\)
\(\Rightarrow\frac{2}{5}\left(x+1\right)=\frac{3}{5}-1\)
\(\Rightarrow\frac{2}{5}\left(x+1\right)=-\frac{2}{5}\)
\(\Rightarrow x+1=-\frac{2}{5}:\frac{2}{5}\)
\(\Rightarrow x+1=-1\)
\(\Rightarrow x=-1-1\)
\(\Rightarrow x=-2\)
\(\left(\frac{2}{7}\times x+1\right)\times\left(3-\frac{1}{2}\times x\right)=0\)
\(TH1:\frac{2}{7}\times x+1=0\)
\(\frac{2}{7}\times x=-1\)
\(x=-\frac{2}{7}\)
\(TH2:3-\frac{1}{2}\times x=0\)
\(\frac{1}{2}\times x=3\)
\(x=\frac{3}{2}\)
Vậy \(x\in\left\{\frac{3}{2};-\frac{2}{7}\right\}\)
\(\frac{5}{4}\times x+1=\frac{1}{2}x+\frac{3}{4}\)
\(\frac{5}{4}x-\frac{1}{2}x=\frac{3}{4}-1\)
\(\left(\frac{5}{4}-\frac{1}{2}\right)x=-\frac{1}{4}\)
\(\frac{3}{4}x=-\frac{1}{4}\)
\(x=-\frac{1}{4}\times\frac{4}{3}\)
\(x=-\frac{1}{3}\)
Vậy \(x\in\left\{-\frac{1}{3}\right\}\)
Biết \(x^2-2x-1=0\). Tính biểu thức \(\dfrac{x^6-6x^5+12x^4-8x^3+2015}{x^6-8x^3-12x^2+6x+2015}\)
Ta có : \(x^2-2x-1=0
\)
\(\Leftrightarrow \)\((x-1)^2=2\)
\(\Leftrightarrow
\)\(\left[\begin{array}{}
x-1=\sqrt{2}\\
x-1=-\sqrt{2}
\end{array} \right.\)
Đặt P = \(\dfrac{x^6-6x^5+12x^4-8x^3+2015}{x^6-8x^3-12x^2+6x+2015}\)
=\(\dfrac{(x^6-2x^5-x^4)-(4x^5-8x^4-4x^3)+(5x^4-10x^3-5x^2)-(2x^3-4x^2-2x)+(x^2-2x-1)+2016}
{(x^6-2x^5-x^4)+(2x^5-4x^4-2x^3)+(5x^4-10x^3-5x^2)+(4x^3-8x^2-4x)+(x^2-2x-1)+12x+2016}\)
=\(\dfrac{x^4(x^2-2x-1)-4x^3(x^2-2x-1)+5x^2(x^2-2x-1)-2x(x^2-2x-1)+(x^2-2x-1)+2016}
{x^4(x^2-2x-1)+2x^3(x^2-2x-1)+5x^2(x^2-2x-1)+4x(x^2-2x-1)+(x^2-2x-1)+12x+2016}\)
=\(\dfrac{2016}{12x + 2016}\)
=\(\dfrac{2016}{12(x+1)+2004}\)
=\(\dfrac{168}{x+1+167}\)
=\(\left[\begin{array}{}
\dfrac{168}{\sqrt{2}+167}\\
\dfrac{168}{-\sqrt{2}+167}
\end{array} \right.\)
Chú thích: Hình như mẫu là \(-6x\) chứ không phải \(6x
\) bạn ạ. Hay là mình phân tích sai thì cho mình xin lỗi nhé.
a) 2x-1/11+2x-2/12+2x-3/13=2x+5/5+2x+6/4+2x+7/3
b) x-1/2016+x-2/2015+x-3/2014+x-4/2013+x-5/2012 -5=0
c) x+2017/2+x+2015/3+x+2013/4+x+2011/5+8=0
giúp mình với mọi người làm ơn đi mình cần gấp lắm!!!!
a) 2x-1/11+2x-2/12+2x-3/13=2x+5/5+2x+6/4+2x+7/3
b) x-1/2016+x-2/2015+x-3/2014+x-4/2013+x-5/2012 -5=0
c) x+2017/2+x+2015/3+x+2013/4+x+2011/5+8=0
giúp mình với mọi người làm ơn đi mình cần gấp lắm!!!!