Câu hỏi của ๖²⁴ʱ๖ۣۜDươηɠ ๖ۣۜMĭηɦ ๖ۣۜ...

a, ( 2 - 3a )2 - ( 3 - a )2= ( 2 - 3a - 3 + a ) ( 2 - 3a + 3 - a )= ( -1 - 2a ) ( 5 - 4a )= - ( 2a + 1 ) ( 5 - 4a )b, x3 + 2x2 - x - 2= ( x3 + 2x2 ) - ( x + 2 )= x2 ( x + 2 ) - ( x + 2 )= ( x2 - 1 ) ( x + 2 )= ( x - 1 ) ( x + 1 ) ( x + 2 ) Câu trả lời: a, ( 2 - 3a )2 - ( 3 - a )2= ( 2 - 3a - 3 + a ) ( 2 - 3a + 3 - a )= ( -1 - 2a ) ( 5 - 4a )= - ( 2a + 1 ) ( 5 - 4a )b, x3 + 2x2 - x - 2= ( x3 + 2x2 ) - ( x + 2 )= x2 ( x + 2 ) - ( x + 2 )= ( x2 - 1 ) ( x + 2 )= ( x - 1 ) ( x + 1 ) ( x + 2 )