gente urgente me ajudem e A = 3xy + 2xz - 6x + 8z, B = - 5xy - 4xz + 7x + z e C = - 12xy + 10xz + 9x - 15z, determine A + B - C.

a)12xy - 12xz - 8x + 24z

b)12xy + 10xz - 5x + 20z

c)10xy - 12xz - 4x + 24z

d)- 15xy + 8xz + 10x - 6z

e)n.d.a.



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