tim so nguyen x thỏa mãn x-6<0 va 3-x<0
Tim cap so nguyen x,y thỏa mãn phương trình xy^2- (x-2)( x^4 +2x+1)=2y^2
\(xy^2-\left(x-2\right)\left(x^4+2x+1\right)=2y^2\)
\(\Rightarrow xy^2-2y^2-\left(x-2\right)\left(x^4+2x+1\right)=0\)
\(\Rightarrow y^2\left(x-2\right)-\left(x-2\right)\left(x^4+2x+1\right)=0\)
\(\Rightarrow\left(x-2\right)\left(y^2-x^4-2x-1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\y^2-x^4-2x-1=0\end{matrix}\right.\)
Thay \(x=2\) vào \(y^2-x^4-2x-1=0\) ta có:
\(y^2-2^4-2\cdot2-1=0\)
\(\Rightarrow y^2-21=0\)
\(\Rightarrow y^2=21\)
\(\Rightarrow\left[{}\begin{matrix}y=\sqrt{21}\\y=-\sqrt{21}\end{matrix}\right.\)
Vậy (x;y) thỏa mãn là: \(\left(2;\sqrt{21}\right);\left(2;-\sqrt{21}\right)\)
lý thuyết đầy đủ các phuong phap giai phuong trinh nghiem nguyen
cho số nguyen x thỏa mãn 55-(6-x)=15-(-6)
55-(6-x)=15-(-6)=21
6-x=55-21=34
x=6-34=-28
55-(6-x)=15-(-6)
55-(6-x)=15+6
55-(6-x)=21
6-x=55-21
6-x=34
x=6-34
x=-28
55-(6-x)=15-(-6)
55-(6-x)=15+6=21
6-x=55-21
6-x=34
x=6-34
x=-28
tick nha
tim x dua vao quan he uoc boi:
tim so tu nhien x sao cho x-1 la uoc cua 12
tim so tu nhien x sao cho 2x+1 la uoc cua 28
tim so tu nhien x sao cho x+15 la boi cua x+3
tim cac so nguyen x,y sao cho (x+1)(y-2)=3
tim so nguyen x sao cho(x+2).(y-1)=2
tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180
tim so nguyen to x,y biet x+y=12 va UCLL (x:y)=5
tim so tu nhien x,y biet x+y=32 va UCLL (x:y)=8
tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100<x<150
tim so x nho nhat khac 0b biet x chia het cho 24 va 30
40 chia het cho x . 56 chia het cho x va x>6
tim so nguyen x thoa man
x/6=-1/2
\(\dfrac{x}{6}=-\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{6}{-2}=-3\)
`x/6=(-1)/2`
`=>x/6=(-3)/6`
`=>x=-3`
Vậy `x=-3`
\(\dfrac{x}{6}\)=\(\dfrac{-1}{2}\)⇒\(x.2=-6\)⇒\(x=-3\)
tim so nguyen x/3 - 4/y = 7/6
\(\dfrac{x}{3}-\dfrac{4}{y}=\dfrac{7}{6}\left(y\ne0\right)\)
\(\Rightarrow\dfrac{6xy}{18y}-\dfrac{72}{18y}=\dfrac{21y}{18y}\)
\(\Rightarrow6xy-72=21y\)
\(\Rightarrow6xy-21y=72\Rightarrow3y\left(2x-7\right)=72\Rightarrow y\left(2x-7\right)=24\)
\(\Rightarrow\left(2x-7\right)\&y\in\left\{-1;1;-2;2;-3;3;-4;4;-6;6;-8;8;-12;12;-24;24\right\}\)
\(\Rightarrow\left(x;y\right)\in\left\{\left(3;-24\right);\left(4;24\right);\left(\dfrac{5}{2};-12\right);\left(2;-8\right);\left(5;8\right);\left(\dfrac{3}{2};-6\right);\left(\dfrac{11}{2};6\right);\left(\dfrac{1}{2};-4\right);\left(\dfrac{13}{2};4\right);\left(-\dfrac{1}{2};-4\right);\left(\dfrac{15}{2};3\right)\right\}\)
.... đến đây bạn tự tìm ra x;yϵZ
a,Tim cac so nguyen a,b sao cho a.b=-3
b,tinh tong cac so nguyen x biet: -6<x+2<8
c,tim tat ca cac U(-15)
bấm vào chữ 0 đúng sẽ hiện ra kết quả
tìm cặp số nguyen (x,y) thỏa mãn 2 Ix-2007 I+3=6/Iy-2008I+2
tim so nguyen x
[x-6].[7-x]=0
Ta có:
\(\left(x-6\right)\left(7-x\right)=0\Rightarrow\hept{\begin{cases}x-6=0\\7-x=0\end{cases}}\Rightarrow\hept{\begin{cases}x=6\\x=7\end{cases}}.\)
Vậy x=6 hoặc x=7, giải chi tiết rồi nhé!
tim so nguyen x biet x-(-25-17-2x)=6+x
=>x+25+17+2x=6+x
=>3x+42=6+x
=>3x-x=6-42
=>2x=-36
=>x=-18