Question

eliminar signos de agrupacion y reduce los terminos semejantes
1. 2a+[a+(b-a)]+[a-b+(-2b+a)]
2. 4x2+[-(x2-xy)+(-3y2+2xy)]
3. x2- {-7xy+[-x2-(y2-3xy+2x2)] }
4. -a+{-a-[-a+(a+1)] }+2a
5. [-2x+(3x-23y-5y)-(18x+3y-4x)]+[(x-3y)-(-5x+y2)]

Answer 1

2a+[a+(b-a)]+[a-b+(-2b+a)]
2a+[a+b-a]+[a-b-2b+a]
2a+[+b]+[2a-3b]
2a + b +2a - 3b
4a - 2b

4x2+[-(x2-xy)+(-3y2+2xy)]
4x2 + [-x2 + xy - 3y2 + 2xy ]
4x2 - x2 + xy - 3y2 +2xy
3x2 + 3xy -3y2
3(x2+xy-y2)

x2- {-7xy+[-x2-(y2-3xy+2x2)] }
x2- {-7xy+[-x2-y2+3xy-2x2] }
x2- {-7xy-x2-y2+3xy-2x2 }
x2+7xy+x2+y2-3xy+2x2 
4x2 +4xy + y2

-a+{-a-[-a+(a+1)] }+2a
-a+{-a-[-a+a+1] }+2a
-a+{-a+a-a-1}+2a
-a+{-a-1} +2a
-a-a-1+2a
-2a-1+2a
-1