hai thanh pho A va B cach nhau 135 km . mot o to di tu A den B voi van toc 54 km/gio . hoi sau khi khoi hanh 1 gio 40 phut thi o to con cach B bao nhieu km
de , ta lay so do + 3 phan nguyen thi ra
trong ba so nhuyen a,b,c co mot so nguyen duong va mot so nguyen am, mot so =0 ngoai ra con biet them rang |a|=b^2.(b-c). Hoi so nao am so nao duong , so nao =0
tim so nguyen a biet so lien sau a la mot so nguyen duong va so lien truoc a la mot so nguyen am
Bai 1: a)Tim so tu nhien a biet 1960va2002 chia cho a cung co so du la 28
b)Tim 2 sop tu nhien a va b , biet :BCNN(a,b)=300;UCLN(a,b)=15 va a+15=b
Bai 2:a)Tong sau la binh phuong so nao ?
S=1+3+5+7+...+199
b) Cho so ab va so ababab
1)chung to ababab la boi cua ab
2)So 3 va 10101 co phai la uoc cua ababab khong , vi sao?
Bai 3
a)Hay viet them dang sau so 664 ba chu so de nhan duoc sdo co 6 chu so chia het cho 5,9,11
b)Tim so nguyen x thuoc Z biet rang :
(x^2-1)(x^2-4)<0
Bai 4 :tim so nguyen x va y biet: xy-x+2y=3
cho biet a la so nguyen duong lon nhat co bon chu so va b la so nguyen am nho nhat co ba chu so . Tinh tong a +b
dien dung sai
a/tich cua hai so nguyen duong la mot so nguyen duong
b/tich cua hai so nguyen am la mot so nguyen am
c/tich cua 2 so nguyen cung dau luon lon hon moi so do
d/tich cua hai so nguyen khac dau luon nho hon moi so do
e/neu tich hai so nguyen la mot so nguyen duong thi hai so do deu la so nguyen duong
f/neu tich hai so nguyen la mot so nguyen am thi hai so do deu la so nguyen am
cho 3 so a,b,c la so nguyen . Trong do co 1 so nguyen am , 1 so nguyen duong va 1 so bang 0 , thoa man IaI=b^2.(b-c) . Hoi a,b,c thuoc loai so nao
Giup mk bai nay nha
A=-3/n+2 + 10/n+2 la mot so nguyen
a la so nguyen am neu biet b la so nguyen am hoac b=0
b...................dương .........a...............dương .........a=0
tinh gia tri cua bieu thuc a+b biet rang a la so nguyen am lon nhat co 2 chu so b la so nguyen am nho nhat co 2 chu so
giup minh voi cam on
