=2x? y+{2xy-9x? y+6xy-4xy? }=2x? y+{8xy-9x? y-4xy? }
=2x? y+8xy-9x? y-4xy? =8xy-7x? y-4xy?
2. Let x be removed from the original polynomial. The part of +6x-6 is m, so there is m+x? +6x-6=2x? -2x+3,
And then m=x? -8x+9, so the original polynomial is
m-(x? +6x-6)=x? -8x+9-(x? +6x-6)=x? -8x+9-x? -6x+6
= 15- 14x;
Grandpa's age is three times that of Xiaohua's father and his age difference, and he is eight years younger. I don't understand who he is referring to. ...