Đáp án:
Giải thích các bước giải:
a) 3x(x +1) – 5y(x + 1)
= ( x + 1 ) ( 3x - 5y )
b) 3x(x – 6) – 2(x – 6)
= ( x - 6 ) ( 3x - 2 )
c) 4y(x – 1) – (1 – x)
= 4y(x – 1) + (x - 1 )
= ( 4y + 1 ) ( x - 1 )
d) (x – 3)3 + 3 – x
= 3 ( x - 3 ) - ( x - 3 )
= 2 ( x - 3 )
( x - 3 )³ + 3 - x
= ( x - 3 ) [( x - 3 )² - 1 ]
= ( x - 3 ) ( x - 4 ) ( x - 2 )
e) 7x(x – y) – (y – x)
= 7x(x – y) + (x - y )
= ( 7x + 1 ) ( x - y )