Add the following:
(1) $a - b + a b, b - c + b c, c - a + a c$
(2) $2 l m + 2 m n, - 7 l m + 2 n l$

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Solution

(1) $a - b + a b + b - c + b c + c - a + a c =$ $a b + b c + a c$
(2) $2 l m + 2 m n - 7 l m + 2 n l =$ $- 5 l m + 2 m n + 2 n l$

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l^{2} + m^{2}, m^{2} + n^{2}, n^{2} + l^{2}, 2 l m + 2 m n + 2 n l

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Add the following:(1) a−b+ab,b−c+bc,c−a+ac(2) 2lm+2mn,−7lm+2nl

(1) a−b+ab+b−c+bc+c−a+ac= ab+bc+ac(2) 2lm+2mn−7lm+2nl= −5lm+2mn+2nl

Add the following:
(1) $a - b + a b, b - c + b c, c - a + a c$
(2) $2 l m + 2 m n, - 7 l m + 2 n l$

(1) $a - b + a b + b - c + b c + c - a + a c =$ $a b + b c + a c$
(2) $2 l m + 2 m n - 7 l m + 2 n l =$ $- 5 l m + 2 m n + 2 n l$