Question

Sendo A=a+1 B=1/2 a²-3 e C=2a-4 caucule
a)a.b-c

b)a.c+2B

c)A(B-C)

d)B-2AC

de preferencia com as contas ganha a melhor respota quem colocar as contas

Answer 1

A= a+1 B=0,5a²-3 e C=2a-4

a)A*B-C = (a+1)*(0,5a²-3)-(2a-4) = 0,5a³-3a+0,5a²-3-2a+4 = 0,5a³+0,5a²-5a+1

b)A*C+2B = (a+1)*(2a-4)+2*(0,5a²-3) = 2a²-4a+2a-4+1a²-6 = 3a²-2a-10

c) A(B-C) = (a+1)*(0,5a²-3-(2a-4)) = (a+1)*(0,5a²-3-2a+4) = (a+1)*(0,5a²-2a+1) = 0,5a³-2a²+1a+0,5a²-2a+1 = 0,5a³-1,5a²-a+1

d)B-2AC = 0,5a²-3-2*(a+1)*(2a-4) = 0,5a²-3-2*(2a²-4a+2a-4) = 0,5a²-3-2*(2a²-2a-4) =
0,5a²-3-4a²+4a+8 = -3,5a²+4a+5