Question

Viết dưới dạng tích các tổng sau

1) ab + ac

2) ab-ac+ad

3) ax-bx-cx+dx

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

5) ac-ad+bc-bd

6) ax+by+bx+ay

Answer 1

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)

Answer 2

ab + ac = a ( b + c )

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

ax - bx - cx + dx = x ( a - b - c + d )