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1, ab + ac = a(b+c)
2, ab - ac + ad = a(b-c+d)
3, ax-bx-cx+dx = x(a-b-c+d)
4, a(b+c) - d(b+c) = (a-d)(b+c)
5, ac-ad+bc-bd = a(c-d) + b(c-d) = (a+b)(c-d)
6, ax+by+bx+ay=ax+ay+bx+by=a(x+y)+b(x+y)=(a+b)(x+y)
a(b+c)
a(b-c+d)
x(a-b-c+d)
(b+c)(a-d)
a(c-d)+c(c-d)=(c-d)(a+c)
a(x+y)+b(x+y)=(x+y)(a+b)
T
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1.ac - ad + bc - bd
= a.(c - d ) + b.( c - d )
= ( c - d ) . a + b
2. ax + by +bx + ay
= a.( x + y ) + b. ( y + x )
= ( x + y ) . ( a + b )
hihi
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
ab + ac = a(b + c)
ab - ac + ad = a(b - c + d)
ax - bx - cx + dx
=x(a - b - c + d)
![](https://rs.olm.vn/images/avt/0.png?1311)
A = ab - ac + ad
= a(b - c + d)
B = ac + ad - bc - bd
= a(c + d) - b(c + d)
= (a - b)(c + d)
![](https://rs.olm.vn/images/avt/0.png?1311)
ab-ac+ad
=a.(b-a+d)
b) ac+ad-bc-bd
=c.(a-b)+d(a-b)
=(a-b).(c+d)
![](https://rs.olm.vn/images/avt/0.png?1311)
1) ab + ac = a(b + c)
2) ab - ac + ad = a(b - c + d)
3) ax - bx - cx + dx = x(a - b - c + d)
4) a(b + c) - d(b + c) = (b + c)(a - d)
5) ac - ad + bc - bd = a(c - d) + b(c - d) = (c - d)(a + b)
6) ax + by + bx + ay = (ax + ay) + (bx + by) = a(x + y) + b(x + y) = (x + y)(a + b)
ab + ac = a ( b + c )
ab - ac + ad = a ( b - c + d )
ax - bx - cx + dx = x ( a - b - c + d )
![](https://rs.olm.vn/images/avt/0.png?1311)
1/ab+ac=a(b+c)
2/ab-ac+ad=a(b-c)+ad=a(b-c+d)
3/ax-bx-cx+dx=x(a-b-c)+xd=x(a-b-c+d)
4/a(b+c)-d(b+c)=(ab+ac)-(bd+cd)=b(a+d)-c(a+d)=a+d(b+c)
5/ac-ad+bc-bd=a(c-d)+b(c-d)=c-d(a+b)
6/ax+by+bx+ay=a(x+y)+b(x+y)=x+y(a+b)
a)=a(b-c+d)
b)=a(c+d)-b(c-d)
=a(c+d)+b(c+d)
=(c+d).(a+b)
Tick nha
a) a(b-c+d)
b) a.0