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Ask the master to solve the important process in the first grade mathematics ~ good addition ~
1. Original formula =2x? y+{2xy-[3x? y+6x? y-6xy]-4xy? }=2x? y+{2xy-[9x? y-6xy]-4xy? }

=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. ...