Ta có:

a(b-c)-c(b-d)+a(c+d)+bc

=ab-ac-bc+cd+ac+ad+bc

=ab+cd+ad

Hok tốt !!!

a( b-c ) - c(b-d) + a(c+d) +bc

= ab -ac - bc + cd + ac + ad + bc

=ab + cd + ad

A=a.5-ab+ba-b.5-5a-3b=-8b

a)= a-c+d-c+a-d

=2a-2c=2(a-c)

b)=-a-b+c-d+a-b-c-d

=-2b-2d

=2.(-b)-2d=2(-b-d)

c)=ab-ac-ad-ab-ac+ad

=-2.ac

Gấp đến mức độ nào vậy . Bài này đơn giản mà

minh lop 6 sao lam duoc toan lop ?

a. = 12 - 25 + 36 - 12 + 36 - 57

= (12 - 12) + (36 + 36) - (25 + 57)

= 0 + 72 - 82

= -10

b. = -23 - 5 + 6 - 17 + 23 - 5 - 83 - 6

= (-23 + 23) + (-5 - 5) + (6 - 6) - (17 + 83)

= 0 + (-10) + 0 - 100

= -110

c.?

Ta có 
+> A = (a+b) - (a-b) + (a-c) -(a+c)
        = a+b-a+b+a-c-a-c
        = (a-a+a-a) + (b+b) - (c+c)
        = 2b-2c
        = 2(b-c)
+> B = (a+b-c) + (a-b+c) - (b+c-a) - (a-b-c)
        = a+b-c+a-b+c-b-b+a-a+b+c
        = (a+a+a-a) + (b-b-b-b+b) + (-c+c+c)
        = 2a - b + c

A = a + b - a + b + a - c - a - c = (a - a + a - a) + (b + b) + (-c - c) = 2b - 2c = 2.(b - c)

B = a + b - c + a - b + c - b - c + a - a + b + c = (a + a + a - a) + (b - b - b + b) + (-c + c - c + c) = 2a 

C1: \(A=\left(\frac{36}{6}-\frac{4}{6}+\frac{3}{6}\right)-\left(\frac{150}{30}+\frac{50}{30}-\frac{45}{30}\right)-\left(\frac{18}{6}-\frac{14}{6}+\frac{15}{6}\right)\)

\(=\frac{35}{6}-\frac{155}{30}-\frac{19}{6}=\frac{35}{6}-\frac{31}{6}-\frac{19}{6}=-\frac{15}{6}=-2\frac{1}{2}\)

C2: \(6-\frac{2}{3}+\frac{1}{2}-5-\frac{5}{3}+\frac{3}{2}-3+\frac{7}{3}-\frac{5}{2}\)

\(=\left(6-5-3\right)-\left(\frac{2}{3}+\frac{5}{3}-\frac{7}{3}\right)+\left(\frac{1}{2}+\frac{3}{2}-\frac{5}{2}\right)\)

\(=-2-0-\frac{1}{2}=-2\frac{1}{2}\)

a-b+a+c nha bn

D=(10-a+b)-(10-b+c)-(10-c-a)

D= 10-a+b-10+b-c-10+c+a

D=(10-10-10)-(a-a)+(b+b)-(c-c)

D= -10+2b