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The answer to the seventh grade math exercise book 4.5.
1.( 1,3) 2.(- 1x) 2

(2/3ab) 3。 ( 1)7a(2)5x+5/2y(3)9mn+4m-2

4.x= 1.5 5。 1/2n×( 1-( 1/3))6。 ( 1) a+b+a+b+a-3+26

= 1/3n =3a+4b-3

(2). When A is 2 and B is 3: (a+b)+((a+b)+(a-3))+(2b)

= 15