Question

Biến đổi tổng thành tích

a)ab-ac+ad

b)ac+ad-bc-bd

Answer 1

a) Ta có \(ab-ac+ad=a.\left(b-c+d\right)\)

b) Ta có \(ac+ad-bc-bd=a.\left(c+d\right)-b.\left(c+d\right)\)

\(=\left(c+d\right).\left(a-b\right)\)

Answer 2

a) ab - ac + ad

= a.b - a.c + a.d

= a.(b-c+d)

b) ac + ad - bc - bd

= a.c + a.d - b.c - b.d

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

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

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

Answer 3

a, ab - ac + ad

= a . b - a . c - a . d

= a . ( b - c - d )

b, ab + ad - bc - bd 

= a . b + a . d - b . c - b .d

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

Đúng thì tíck mk nha !!

Answer 4

1)ab-ac+ad=a*(b-c+d)

2)ac+ad-bc-bd=a*(c+d)-b*(c+d)=(a-b)*(c+d)

Answer 5

\(a)\)

ab - ac + ad = \(a\cdot(b-c+d)\)

\(b)\)

ac + ad - bc - bd = \(a\cdot(c+d)-(bc+bd)\)

                         = \(a\cdot(c+d)-b\cdot(c+d)\)

                         \(=(c\cdot d)\cdot(a-b)\)

Answer 6

a ) ab - ac + ad

= a . b - a . c + a . d

= a . ( b - c + d )

b ) ac + ad - bc - bd

= a . c + a . d - b . c - b . d

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

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

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

Answer 7

a)ab-ac+ad

=a.(b-c+d)

b))ac+ad-bc-bd

​=a.(c+d)-b.(c+d)

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

Answer 8

a) \(ab-ac+ad=a.b-a.c+a.d\). Đặt thừa số chung a. Ta có:

\(\Leftrightarrow a\left(b-c+d\right)\)

b) \(ac+ad-bc-bd=a.c+a.d-b.c-b.d\)

\(=a\left(c+d\right)-b\left(c-d\right)\)

\(=\left(c.d\right)+\left(a-b\right)\)

Answer 9

Cho sửa lại:

a) ab - ac + ad

= a.b - a.c + a.d

= a.(b-c+d)

b) ac + ad - bc - bd

= a.c + a.d - b.c - b.d

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

= a.(c-d) + b(c-d)

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