Resposta:
a) (3xy) - (-xy) + (xy)
3xy+xy+xy
5xy
====================
b) (15x)-(-3x)-(7x)+(-2x)
15x+3x-6x-2x
18x-8x
10x
c)(-9y)-(3y)-(y)+(-2y)
-9y-3y-y-2y
-15y
d)(3n)+(-8n)+(4n)-(-5n)
3n-8n+4n+5n
12n-8n
4n
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Resposta:
a) (3xy) - (-xy) + (xy)
3xy+xy+xy
5xy
====================
b) (15x)-(-3x)-(7x)+(-2x)
15x+3x-6x-2x
18x-8x
10x
====================
c)(-9y)-(3y)-(y)+(-2y)
-9y-3y-y-2y
-15y
====================
d)(3n)+(-8n)+(4n)-(-5n)
3n-8n+4n+5n
12n-8n
4n