tim x cho biet (x-1)(x+3)<0
H24
Những câu hỏi liên quan
a, Cho F(x) = a x+b . Tim a,b biet f(0) = 3 va F(2) =-1
b, Cho F(x) =a x+ b. Tim a,b biet F(1) = -1 va F(-2) = 8
c, Cho F(x) =a x +b .tim a,b biet F(0) = 1 va F(-2) = -9
tim x dua vao quan he uoc boi:tim so tu nhien x sao cho x-1 la uoc cua 12tim so tu nhien x sao cho 2x+1 la uoc cua 28tim so tu nhien x sao cho x+15 la boi cua x+3tim cac so nguyen x,y sao cho (x+1)(y-2)3tim so nguyen x sao cho(x+2).(y-1)2tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180tim so nguyen to x,y biet x+y12 va UCLL (x:y)5tim so tu nhien x,y biet x+y32 va UCLL (x:y)8tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100x150tim so x nho nhat khac 0b biet...
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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 x biet ( x - 1 ) chia het cho ( 2x+3)
a, tim x€Z biet (x-6) chia het cho (x-5)
b, tim x€Z, y€Z biet (x-1).(xy-5)=5
cho x,y ti le thuan tim x biet x2=3,y1=-2,y2=\(\dfrac{3}{8}\) tim x2,y2biet y2-x2=-5,x1=-6,y1=4
Vì x,y tỉ lệ thuận nên \(\dfrac{x_1}{x_2}=\dfrac{y_1}{y_2}\)
a: \(\dfrac{x_1}{x_2}=\dfrac{y_1}{y_2}\)
nên \(\dfrac{x_1}{3}=\dfrac{-2}{\dfrac{3}{8}}=-2\cdot\dfrac{8}{3}=-\dfrac{16}{3}\)
=>\(x_1=-16\)
b: \(\dfrac{x_1}{x_2}=\dfrac{y_1}{y_2}\)
\(\Leftrightarrow\dfrac{x_2}{x_1}=\dfrac{y_2}{y_1}\)
\(\Leftrightarrow\dfrac{x_2}{-6}=\dfrac{y_2}{4}\)
Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:
\(\dfrac{x_2}{-6}=\dfrac{y_2}{4}=\dfrac{y_2-x_2}{4-\left(-6\right)}=\dfrac{-5}{10}=-\dfrac{1}{2}\)
Do đó: \(x_2=3;y_2=-2\)
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1) Tim a, b thuoc Q biet: a-b=2(a+b)=a:b
2) Tim x thuoc Q sao cho: (x-1)(x+3)<0
1. a) Tim so tu nhien a biet rang khi chia 39 cho a thi du 3 con chia cho 49 thi du 4
b)Tim so tu nhien x biet: 12 chia het cho ( x-2 )
c) Tim so tu nhien n biet: 1+3+5+...+(2n+1) = 72
mik dag gap lam bn nao giai dc nhanh mik tick cho
tim x biet (2x-3) chia het cho x+1
Ta có : \(2x-3⋮x+1\)
\(\Rightarrow2x+2-5⋮x+1\)
\(\Rightarrow2\left(x+1\right)-5⋮x+1\)
Mà : \(2\left(x+1\right)⋮x+1\)suy ra : \(5⋮x+1\)
\(\Rightarrow x+1\inƯ\left(5\right)=\left\{-5;-1;1;5\right\}\)
\(\Rightarrow x\in\left\{-6;-2;0;4\right\}\)
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Tim so nguyen x biet
3x + 1 - 3x - 2 = 702
x - 3 chia het cho x + 1
a) \(3^{x+1}-3^{x-2}=702\) \(\Leftrightarrow3^x.3-3^x:3^2=702\)
\(\Leftrightarrow3^x.3-3^x.\frac{1}{9}=702\)\(\Leftrightarrow3^x.\left(3-\frac{1}{9}\right)=702\)
\(\Leftrightarrow3^x.\frac{26}{9}=702\)\(\Leftrightarrow3^x=243=3^5\)\(\Leftrightarrow x=5\)
Vậy \(x=5\)