\(2ab=a+b\)
\(a-2ab+b=0\)
\(2a-2.2ab+2b=0\)
\(2a-2b\left(2a-1\right)=0\)
\(2a-1-2b\left(2a-1\right)=-1\)
\(\left(2a-1\right)\left(1-2b\right)=-1\)
\(\Rightarrow2a-1=1\) thì \(1-2b=-1\) \(\Rightarrow a=1\) thì \(b=1\)
\(\Rightarrow2a-1=-1\) thì \(1-2b=1\) \(\Rightarrow a=0\) thì \(b=0\)
Vậy \(\left(a;b\right)=\left(0;0\right)\left(1;1\right)\)
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
Tim a,b thuoc Q sao cho a+b=a×b(b khac 0)
bai 1 cmr
a)n^3+11n chia het cho 6 voi moi n thuoc Z
b)mn(m^2-n^2)chia het cho 3 voi moi m,n thuoc Z
bai 2 tim x,y thuoc Z
a)(x-1)(3-y)=(-7)
help me
Tim a,b thuoc N sao cho: (2016a +13b -1)*(2016^a +2016a +b)= 2015
cho cac tap hop
A= { x thuoc Z / -3<x nho hon bang 7}
B = {x thuoc Z /3 nho hon bang |x| <7 }
C = { x thuoc Z / |x| < 5}
Tim A giaoB; B giao C ; C giao A
B hop C ; A hop C
LAM NHANH HO MIK NHA MIK CAN GAP !PLEASE! AI LAM TRA LOI NHANH MIK TICK CHO
tim a,b thuoc Z biet
1/a+1/b=1/2003
Cho A = n + 2 / n - 5
tim n thuoc z de A thuoc z
cho phan so A=5n-19/n-4 tim n thuoc z de A thuoc z
Cho a thuoc Z+ b thuoc Z- .Hay so sanh IaI va IbI trong cac truong hop
A)a+b thuoc Z+
B)a+b thuoc Z-
