Tim tap hop cac so nguyen x sao cho-6<x5 hay tinh tong cac so nguyen trong tap hop do
tap hop cac so nguyen to x sao cho 6 chia het cho (x-1)
6 chí hết cho 6,3,2,1
x-1=6 => x=5
x-1=3 => x=2
x-1=2 => x=1
x-1=1 => x=0 không phải số nguyên tố
vậy x cần tìm là 5,2,1
tim giao cua 2 tap hop A va B biet rang:
a , A la tap hop cac so chia het cho 24 , B la tap hop cac so chia het cho 120
b, A la tap hop cac so chan, B la tap hop cac so nguyen to
phan tich cac so sau ra thua so nguyen to roi tim tap hop cac uoc cua moi so .neu cach tim tap hop cac uoc moi so
51 ; 75 ; 42 ; 30
\(51=3.17\)
\(\LeftrightarrowƯ\left(51\right)=\hept{ }3;17;1;51\)
\(75=3.5^2\)
\(\LeftrightarrowƯ\left(75\right)=\hept{ }3;5;25;75;1\)
\(42=2.3.7\)
\(\LeftrightarrowƯ\left(42\right)=\hept{ }1;2;3;7;42;14;6\)
\(30=2.3.5\)
\(\LeftrightarrowƯ\left(30\right)=\hept{ }1;2;3;5;15;10;6;30\)
phan tich cac so sau ra thua so nguyen to roi tim tap hop cac uoc cua moi so .neu cach tim tap hop cac uoc moi so
51 ; 75 ; 42 ; 30
Tim tap hop cac so nguyen x sao cho
A, |2x - 4| + 2x - 4 = 0
B , |x + 5|- ( x +5) = 0
C, 2 - x = - |2- x|
a: =>|2x-4|=-2x+4
=>2x-4<=0
=>x<=2
b: =>|x+5|=x+5
=>x+5>=0
hay x>=-5
c: =>|x-2|=x-2
=>x-2>=0
hay x>=2
so nguyen la gi .neu x la so nguyen thi x thuoc tap hop Z kohay tap hop z la tap hop cac so nguyen à
cho A= { 8; 45}
B={ 15; 4}
a) tim tap hop C cac so tu nhien x= a+b sao cho a thuoc A va b thuoc B
b) tim tap hpo D cac so tu nhien x = a-b sao cho a thuoc A va b thuoc B
c) tim tap hop E cac so tu nhien x = a.b sao cho a thuoc A va b thuoc B
d) tim tap hop G cac so tu nhien x sao cho a=b.x va a thuoc A; b thuoc B
làm đầy đủ nha
tap hop cac so nguyen x sao cho 15-Ix-2I=12
Ta có:
15-|x-2|=12
|x-2|=15-12
|x-2|=3
=> x-2 \(\in\){-3;3}
Với x-2= -3
x = -3+2
x = -1
Với x-2 = 3
x = 3+2
x = 5
Vậy x\(\in\){-1;5} thì 15-|x-2|=12
=> /x-2/=15-12
=> /x-2/=3
=> x-2={-3;3}
Nếu x-2=3 thì x=5
Nếu x-2=-3 thì x= -1
tim tap hop cac so nguyen x de gia tri cua da thuc x^3+3x-5 chia het cho x^2+2