Các câu hỏi tương tự
chung minh dang thuc
[a+b].[c+d]-[a+d].[b+c]=[a-c].[d-b]
chung minh dang thuc
a, [ b+c ]-b. [ a -c]= [ a+ b].c
b, [b-c ]-a. [b+d]=a.[c+d]
Chung minh rang a/b = c/d thi a/b = a +(-) c/ b +(-) d
choA= a+b-5 B=-b-c+1 C=b-c-4 D=b-a. Chung minh rang A+b= C-D
Chung minh rag
(a-b+c)-(a+c)=-b
(a+b)-(b-a)+c=2a+c
-(a+b-c)+(a-b-c)=-2b
a (b+c)-a (b+d)=a (c-d)
a (b-c)+a (d+c)=a (b+d)
cho 2 p/s a/b vs c/d (a,b,c,d la cac so nguyen duong ) chung minh rang neu a/b < c/d thi b/a > d/c
Chung minh rang voi moi a,b,c,d, la cac so nguyen thi T=(a-b)(a-c)(a-d)(b-c)(c-d) chia het cho 12
Cho a+b=c+d va a^2+b^2=c^2+d^2.Chung minh rang:a^2022+b^2022=c^2022+d^2022
Moi nguoi giup minh voi,minh dang can gap
cho 5 so a, b, c, d, e. Biet a^b=b^c=c^d=d^e=e^a. chung minh 5 so do bang nhau