a.(b-c)-a.(b+d)=-a.(c+d)
a.b-a.c-a.b+a.d=-a.(c+d)
(a.b-a.b)-(a.c+a.d)=-a.(c+d)
0-a.(c+d)=-a.(c+d)
-a.(c+d)=-a.(c+d)
Vậy a.(b-c)-a.(b+d)=-a.(c+d).
Cho a/b =c/d. CMR :
a) a+c/b+d = a-c/b-d.
b) a-b/b = c-d/d.
Ai biet thi chi giup minh voi nhe. Minh dang can gap lam.
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 gapa) 2^2.78+2^3.29-2^3.7
giup minh voi nha minh dang gap lam !!!!!!!!!!!!!!!!!!!
b) 2^2.25.17+5.20.27.10^2.56
chung minh dang thuc
[a+b].[c+d]-[a+d].[b+c]=[a-c].[d-b]
Tim x :
a ) 5x - 1 = 13
b ) ( x - 2 ) = 0
c ) 5 ( x - 7 ) + 8 = 0
d ) ( x - 19 ) * 4 = 36
e ) 3 ( x - 7 ) - 2 = 4
Giup minh voi ! Minh dang can gap lam !
chung minh dang thuc (a+b).(c+d)-(a+d).(b+c)
chung minh dang thuc
a, [ b+c ]-b. [ a -c]= [ a+ b].c
b, [b-c ]-a. [b+d]=a.[c+d]
chung minh dang thuc sau la sai:
a+b+c-d=a-b+c-d
tinh A = 3^6 :3^2 + 2^3 x 2^2
giup minh voi minh dang gap lam!!!!!
