Các câu hỏi tương tự
cho M =(-a +b)-(b+c-a)+(c-a) .Trong do b,c la so nguyen con a la so nguyen am.Chung minh rang bieu thuc M luon luon duong
a la so nguyen am neu biet b la so nguyen am hoac b=0
b...................dương .........a...............dương .........a=0
cho M=a^100+b^100+c^100+d^100 trong do a,b,c,d la cac so nguyen to khac 0 hoi M la so nguyen to hay hop so
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
Cho 2014 so nguyen, trong do tich cua 3 so bat ki luon la 1 so nguyen am.chung to rang tich cua 2014 so nguyen do la mot so nguyen duong
Ai nhanh minh tick luon
Với a,b,c là các chữ số (akhac 0),chứng minh: M=abc-cba/99 la 1 so nguyen (abc;cba la so nguyen)
cho 2014 so nguyen trong do tich cua 3 so bat ki la 1 so am.Chung minh tich cua 2014 so do la so duong
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
a. cho 2017so nguyen trong do 7 so bat ki luon co tong am. hoi tong cua2017 so do la am hay duong?
b. cho 2017 so nguyen trong do 7 so bat ki luon co tich am. hoi tich cua 2017 so do la am hay duong? moi so nguyen do la am hay duong