tim x thuoc z. Thoa man
1\3-(1\6+1\5)<x<1\25-(1\14-1\7)
cac ban oi giup minh voi
1.tim a,b thuoc Z,biet:a.(2b-3)=-6
2.cho x,y thuoc Z thoa man x mu 2 +y mu 2 chia het cho 3.chung to x va y chia het cho 3.
tim x thuoc Z thoa man : (x+3)(x-5)<0
tim cac so m,n,p thoa man : m+n+p+8=2canm-1 + 4cann-2 +6canp-3
tim cac so x,y,z thoa man :canx+cany-1 +canz-2 = 1/2(x+y+z)
tim cac so x,y,z thoa man :x+y+z+4=2canx-2 +4cany-3+6canz-5
cho giá trị tuyệt đối của x+x+1+x+2+x+3=6x.chứng minh x>0.tim x thuoc Z thoa man dang thuc tren
tim cac gia tri x y thoa man
a,(x^2-1)(x^2-16)<0 va x thuoc Z
B,1/x-y/8=1/16 va x y thuoc N
Tim cac gia tri x, y thoa man:
a, ( x2 - 1 ) ( x2 - 16 ) < 0 ca x thuoc z
b, 1/x - y/8 = 1/16 va x, y thuoc N
c, | x+1 | + | x+2 | + | x+3 | = x
tim n thuoc z thoa man
3n-4 chia het cho 2n-1
tim x thuoc Z thoa man : (x^2 - 20)(x^2-15)(x^2 - 10)(x^2 - 5 )<0
https://www.youtube.com/channel/UCjP80p-OtLhNnRs-R4Q7yjw
(4x+3) chia het cho (x-2)
Tim x thuoc Z thoa man
Ta có: 4x + 3 = 4(x - 2) + 11
Do x - 2 \(⋮\)x - 2 => 4(x - 2) \(⋮\)x - 2
Để 4x + 3 \(⋮\)x - 2 thì 11 \(⋮\)x - 2 => x - 2 \(\in\)Ư(11) = {1; 11; -1; -11}
Lập bảng:
x - 2 | 1 | 11 | -1 | -11 |
x | 3 | 13 | 1 | -9 |
Vậy ...
(4x+3) : (x-2)
= 4x -4.2+11 : x -2
= 4(x-2)+11:x-2
=> 11:x-2
=>x-2 thuộc Ư(11)=1;-1;11;-11
Ta có 4 trường hợp:
TH1: x-2=1
x=3
TH2: x-2=-1
x=1
TH3: x-2=11
x=13
TH4: x-2=-11
x=-9
Vậy x=-9 hoặc x=13 hoặc x=1 hoặc x=3.
\(\left(4x+3\right)⋮\left(x-2\right)\)
\(\Rightarrow4\left(x-2\right)+11⋮\left(x-2\right)\)
\(\Rightarrow11⋮x-2\)
\(\Rightarrow x-2\inƯ\left(11\right)=\left\{\pm1;\pm11\right\}\)
\(\Rightarrow x\in\left\{3;1;13;-9\right\}\)
Vậy...................