Explicación paso a paso:
1) 2x+[a+b--(2a+b)]
2x+[a+b+2a+b]
2x+3a+2b
2). 3a--[a+b--(2a+b)]
3a+[a+b+2a+b]
3a+3a+2b
6a+2b
3). 2x--[(x--y)+1]
2x+[x+y+1]
3x+y+1
4). x2-- [ -- 7xy + [-- y2 +(-- x2 +3xy ---2y2) ] ]
x²+[+7xy+[+y²+x²+3xy+2y²]]
x²+[+7xy+3y²+x²+3xy]
x²+[10xy+3y²+x²]
2x²+10xy+3y²
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Explicación paso a paso:
1) 2x+[a+b--(2a+b)]
2x+[a+b+2a+b]
2x+3a+2b
2). 3a--[a+b--(2a+b)]
3a+[a+b+2a+b]
3a+3a+2b
6a+2b
3). 2x--[(x--y)+1]
2x+[x+y+1]
3x+y+1
4). x2-- [ -- 7xy + [-- y2 +(-- x2 +3xy ---2y2) ] ]
x²+[+7xy+[+y²+x²+3xy+2y²]]
x²+[+7xy+3y²+x²+3xy]
x²+[10xy+3y²+x²]
2x²+10xy+3y²