May 2021 1 72 Report
( UFPA ) Sabendo que a seqüência ( 1-3x, x-2, 2x+1 ) é uma PA , o valor de (raiz quadrada de x² + 21) é:?

a. 5

b. 3

c. 4

d. 6

e. 8

Por favor, mostre a conta.

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