(a+b)(c+d)-(a+d)(b+c)=ac+bc+ad+bd-ab-ac-cd-bd
=bc+ad-ab-cd=a(d-b)-c(d-b)=(a-c)(d-b)
Đúng 0
Bình luận (0)
Các câu hỏi tương tự
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
chung minh dang thuc
a.( b - c ) - a ( b + d ) = -a ( c + d )
giup minh voi lam onnnnn.......
Bo dau ngoac roi rut gon bieu thuc :
a) - ( -a + c - d ) - ( c- a + d )
b) - ( a + b - c + d ) + ( a - b - c - d )
c) a( b- c -d ) - a( b + c - d )
Giup minh nhe minh dang can gap
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
chung minh dang thuc:
a, - ( 49 - 3x ) + 41 = 3x - 8
b, - ( a + b + c + 1 ) + ( b - c ) - ( a - c - 1 ) = - c - 2a
chung minh cac dag thuc sau:
a, (-a) (b-c+d)= -ab+ac-ad
b, (a+b) (x+y)-(a+b).y=(a+b).x
c,(2-b+c)-a(2+c)=-ab
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.