Question

So sánh (a+1)(a+2)(a+3)-a(a+1)(a+2) và 3(a+1)(a+2)
*Mong mn giúp mình sớm nhất có thể ^^*

Answer 1

Bài làm:

Ta có: \(\left(a+1\right)\left(a+2\right)\left(a+3\right)-a\left(a+1\right)\left(a+2\right)\)

\(=\left(a+1\right)\left(a+2\right)\left(a+3-a\right)\)

\(=3\left(a+1\right)\left(a+2\right)\)

Answer 2

( a + 1 )( a + 2 )( a + 3 ) - a( a + 1 )( a + 2 )

= ( a + 1 )( a + 2 )( a + 3 - a )

= ( a + 1 )( a + 2 ).3

=> ( a + 1 )( a + 2 )( a + 3 ) - a( a + 1 )( a + 2 ) = 3( a + 1 )( a + 2 )