1) ab + ac
= a ( b + c )
2) ab - ac + ad
= a ( b - a + 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
= x . ( a + b ) + y . ( a + b )
= ( x + y ) . ( a + b )
1) ab + ac
\(\Rightarrow a.\left(b+c\right)\)
2) ab - ac + ad
\(\Rightarrow a.\left(b-c+d\right)\)
3) ax - bx - cx + dx
\(\Rightarrow x.\left(a-b-c-d\right)\)
4) a(b + c) - d(b + c)
\(\Rightarrow\left(b+c\right).\left(a-d\right)\)
5) ac - ad + bc - bd
\(\Rightarrow a.\left(c-d\right)+b.\left(c-d\right)\)
\(\Rightarrow\left(c-d\right).\left(a+b\right)\)
6) ax + by + bx + ay
\(\Rightarrow ax+bx+ay+by\)
\(\Rightarrow x.\left(a+b\right)+y.\left(a+b\right)\)
\(\Rightarrow\left(a+b\right).\left(x+y\right)\)
Hà Giang: bài trước tớ lm sai câu 3 á
sorry!!
1) ab + ac
\(\Rightarrow a\left(b+c\right)\)
2) ab - ac + ad
\(\Rightarrow a\left(b-c+d\right)\)
3) ax - bx - cx + dx
\(\Rightarrow x\left(a-b-c+d\right)\)
4) a(b + c) - d(b + c)
\(\Rightarrow\left(b+c\right)\left(a-d\right)\)
5) ac - ad + bc - bd
\(\Rightarrow a\left(c-d\right)+b\left(c-d\right)\)
\(\Rightarrow\left(c-d\right)\left(a+b\right)\)
6) ax + by + bx + ay
\(\Rightarrow ax+bx+ay+bx\)
\(\Rightarrow x\left(a+b\right)+y\left(a+b\right)\)
\(\Rightarrow\left(a+b\right)\left(x+y\right)\)
