Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
1) -a(-a+c-d)-(c-a+d)
=ad-ac+a2-c+a-d
2) -(a+b)-(c+d)+(a-b-c-d)
=-a-b-c-d+a-b-c-d
=-2b-2c-2d
3) a(b-c-a)-a(b+c-d)
=-ac+ab-a2+ad-ac-ab
=ad-2ac-a2
1. (a-b+c)-(a+c)
= a - b + c - a - c
= -b
2. (a+b)-(b+a)
= a +b - b - a
= 0
3. -(a+b-c)+(a-b-c)
= -a - b + c + a - b - c
= -2b
4. a(b+c)-a(b+d)
= ab + ac - ab - ad
= ac - ad
= a.(c-d)
5. a(b-c)-a.(b+d)
= ab - ac - ab - ad
= -ac - ad
= -a.(c+d)
6. Giống câu 5
Hok tốt !
1/.(a-b+c)-(a+c)
= a - b + c - a - c
= -b
2/(a+b)-(b+a)
= a + b - b -a
=0
3/-(a+b-c)+(a-b-c)
= -a - b + c + a - b - c
= -2b
4/a(b+c)-a(b+d)
= ab + ac - ab + ad
= ac + ad
= a( c + d)
5/a(b-c)-a.(b+d)
= ab - ac - ab + ad
= -ac + ad
6/a(b-c)-a(b+d)
= ab - ac - ab + ad
= a(b - c - b + d)
= a( -c + d)
hok tốt!
1.
1) a ( b + c )
2) a ( b-c+d)
3) x ( a-b-c+d)
4) ( b+c ) (a - d )
5) a (c-d) + b (c-d) =(c-d) (a + b )
6) a ( x+y) + b ( y+x) = (x+y) ( a+b)
2.
1) a - b + c - a - c = -b
2) a + b - b + a + c = 2a + c
3) - a - b + c + a - b - c = -2b
4) ab + ac - ab - ad = ac-ad = a (c-d)
5) ab - ac + ad + ac = ab + ad = a (b+d)
a, -( -a + c - d) - ( c - d + d) = a - c + d - c + d - d = a + d
b, - ( a+b-c+d) + (a-b-c-d) = -a -b+c-d + a-b-c-d = -2b + (-2c)= -2(b+c)
- a-c+d-c+d-d=a-2c+d
- -a-b+c-d+a -b-c-d=-2b-2d
- ab-ac-ad-ab-ac+ad=-2ab-2ac
- ac+ad+bc+bd-ab-ac-bd-cd=ad+bc+bd-ab-bd-cd
a: \(\left(a-b-c\right)-\left(-c+b+a\right)-\left(a-b\right)\)
\(=a-b-c+c-b-a-a+b\)
\(=-a-b\)
b: \(a\left(b+c\right)-a\left(b+d\right)-\left(1+ac-ad\right)\)
\(=ab+ac-ab-ad-1-ac+ad\)
=-1