\(5\in A\); \(5\in B\); \(y\notin B\); \(7\in B\); \(8\in A\)
5 \(\in\) A
5\(\in\) B
Y\(\notin\) B
7\(\notin\)B
8 \(\in\)A
\(5\in A\); \(5\in B\); \(y\notin B\); \(7\in B\); \(8\in A\)
5 \(\in\) A
5\(\in\) B
Y\(\notin\) B
7\(\notin\)B
8 \(\in\)A
Cho tia Ox, A thuoc Ox , B thuoc Ox .
OA =3 Cm, OB = 9cm
M la trung diem cua AB
a) tinh AB
b) CM ; A la trung diem cua OM
c)tinh OM
Xin loi cac cau vi nhan ko dau nhe .
ghi ca loi giai ra cho minh nhe
ai nhanh se dc 3 tick
minh hua.
thanks
Cho x thuoc { -21; -20; -19; -18; -17} va y thuoc { -3; -4; ...; -13; -14}
a) Co bao nhieu gia tri x+y khac nhau ?
b) Hay xac dinh gia tri be nhat va gia tri lon nhat cua x+y.
tim so tu nhien a nho nhat chia het cho 9 va a thuoc vao BC(27,13) > TRa loi a=
a) CHO TONG A = 270 + 3150 + 150 . KHONG THUC HIEN PHEP TINH XET XEM TONG TREN CO CHIA HET CHO 2 ; 3 ; 5 ;9
b) CHO B = 12+ 18 + 21 + x VOI x THUOC N . TIM DIEU KIEN CUA x DE A CHIA HET CHO 3 , DE A KHONG CHIA CHO 3
GIUP MINH VOI CA NHA OI . AI TRA LOI DUNG SE CO 3 LIKE
3) Tim n thuoc Z sao cho :
a)3n+1chia het cho (n-2)
b)4n-3 chia het cho (2n+3)
4)tim x,y thuoc Z sao cho :
a)xy-3x-y-6=7
b)2xy+10y + x =5
ai nhanh minh tick cho
1.Cho x, y thuoc Z
Chung minh : 6x +11y chia het cho 31khi va chi khi: x+7y chia het cho 31
2.Cho x,y,z thuoc Z va x2 +y2=z2
Chung minh: xy chia het cho 12
Ai lam nhanh nhat minh se tich cho
Khong bat buoc lam het 2 cau
1.a. thay chu so thich hop vao dau *de dc hop so: *27
bphan tich cac hop so da tim dc ra thua so ng to
c. tim x thuoc N, biet:
c1: 327 chia het cho x
c2: 327la boi so cua x+12
c3: 327 chia het cho (2.x)
c. tim a,b thuoc N, a<b biet a.b=327
4. a) tong cua 25 SNT nho hon 100 la so chan hay so le?
b) tong cua 2 so NT co the = 999 dc ko? vi sao?
c) tong cua 2 so NT co the = 2007 dc ko? vi sao?
d) tong cua 3 so NT = 1012. tim so nho nhat
ban nao tra loi dung va chi tet minh cho 1 like
ne mik noi ne SNT la so nguyen to
thoi thi giai dung cau naao cung dc minh cung cho like
Tim x thuoc Z biet:
a, |x-5|+x+3=16
b, |x-5|-7≥9
c, |x-4|>x+2
d, ||x+5|-4|=3
Lam nhanh ho minh
AI LAM NHANH VA CACH LAM DAY DU MINH SE TICK CHO
kHONG CAN LAM HET TAT CA CAC CAU
tim gia tri lon nhat cua A=2018-/x-7/-/y+2/
tim gia tri nho nhat cua B /x-500/+/x-300/
tim n thuoc Z,biet: a,3.n+2 chia het cho n-1; b, n^2 +5 chia het cho n+1