Question

Rút gọn biểu thức

\(ab+ac+ad\)

\(2ab+2cd\)

Answer 1

\(ab+ac+ad\)

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

\(2ab+2cd\)

\(=2\left(ab+cd\right)\)

Answer 2

ab + ac + ad

= 10a + b + 10a + c + 10a + d

= 30a + b + c + d

2ab + 2cd

= 200 + 10a + b + 200 + 10c + d

= 400 + 10( a + c ) + b + d