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There is a reward of 20 points for the process of merging similar items in junior high school mathematics to find the following values.
( 1)a-b=-2

3a+b-(b-a)^2+a-5b+2(a-b)^2

=4a-4b+(a-b)^2

=4(a-b)+(a-b)^2

=-8+4

=-4

(2)

2(x+y)-2/3(x-y)+ 1/4(x+y)+2/3(x-y)+2/3(x-y)

=9/4(x+y)+2/3(x-y)

= 35/ 12x+ 19/ 12y

=-35/24-57/24

=-23/6

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