✔ 最佳答案
Q: Simplify
1. ( 4x^2 - y^2 ) / ( 12x^2 - 4xy - y^2 )
2. ( 6 - 11a + 4a^2 ) / ( 14 - a - 3a^2 )
Sol:
1. ( 4x^2 - y^2 ) / ( 12x^2 - 4xy - y^2 )
= [( 2x - y ) ( 2x + y )] / [( 2x - y ) ( 6x + y )]
= ( 2x + y ) / ( 6x + y )
2. ( 6 - 11a + 4a^2 ) / ( 14 - a - 3a^2 )
= [( 2 - a ) ( 3 - 4a )] / [( 2 - a ) ( 7 + 3a )]
= ( 3 - 4a ) / ( 7 + 3a )
Ans: 1. ( 2x + y ) / ( 6x + y ) 2. ( 3 - 4a ) / ( 7 + 3a )