a) m : 4 = \(\frac{m}{4}\)
b) 5 : a = \(\frac{5}{a}\)
c) x : y = \(\frac{x}{y}\)
a) m : 4 = \(\frac{m}{4}\)
b) 5 : a = \(\frac{5}{a}\)
c) x : y = \(\frac{x}{y}\)
Cho a={x thuoc z/ -1<|x+3|<1} viet tap hop a duoi dang liet ke cac phan tu
bai 2
a)chung to rang P=4a2+4a chia het cho 8 voi moi a thuoc z
b)tim a thuoc z sao cho Q=a+7 chia het cho a (a khac 0)
c)tim a thuoc z sao cho M=a+1 chia het a -2 (a khac 2)
1) cho tap hop A={x=a2/a=2k,k thuoc N va 0<a<10} va tap hop B={y thuoc N/y=b^3, b thuoc N}
a)vi\et A va B duoi dang liet ke
b)viet tat ca cac tap hop con cua tap hop A
c)viet tap hop D={x thuoc N/x:64=1} chung to B=D
cac ban co gang giai nhanh giup minh !!thanks
cho A = 1/15 nhan 225/(8+2) + 3/14 nhan 196/(3x+6) (x thuoc Z; x khac -2 )
a) Rut gon A
b) Tim x thuoc Z de A thuoc Z
c) trong cac gia tri nguyen A tim gia tri lon nhat va gia tri nho nhat
cho x=a/b va y=b/m voi a,b,m thuoc Z ;m>0 va x<y .Chung minh rang Z=a+b/2m thi x<Z<t
tim so phan tu trong cac tap hop sau
a)A={x thuoc N/x+8=14,5}
B={y thuoc N/y.3<72}
C={z thuoc N/1+2z>100}
D la tap hop cac so tu nhien le nho hon 10
Cho A = \(\frac{n-1}{n-3}\)(n Khac 0)
a) Tim n thuoc Z de A thuoc Z
b) Tim n thuoc Z de A co gia tri
Cho A thuoc {0.1.2.3.4.5.6.7.8.9.10} biet A co hon 1 phan tu neu x,y,z thuoc A va x<y<z thi z =x.y tim A
Cho A = x+1/x-3; (x thuoc Z; x khac 3). Tim x de A la phan so toi gian