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Tính:
A = 8.(32+1).(34+1)...(316+1)
\(A=8.\left(3^2+1\right)\left(3^4+1\right)....\left(3^{16}+1\right)\\ =\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)....\left(3^{16}+1\right)\\ =\left(3^4-1\right)\left(3^4+1\right)....\left(3^{16}+1\right)\\ =\left(3^8-1\right)....\left(3^{16}+1\right)\\ =\left(3^{16}-1\right)\left(3^{16}+1\right)\\ =3^{32}-1\)
A = 8.(3² + 1)(3⁴ + 1)(3⁸ + 1)(3¹⁶ + 1)
= (3² - 1)(3² + 1)(3⁴ + 1)(3⁸ + 1)(3¹⁶ + 1)
= (3⁴ - 1)(3⁴ + 1)(3⁸ + 1)(3¹⁶ + 1)
= (3⁸ - 1)(3⁸ + 1)(3¹⁶ + 1)
= (3¹⁶ - 1)(3¹⁶ + 1)
= 3³² - 1
\(A=8.\left(3^2+1\right)\left(3^4+1\right)....\left(3^{16}+1\right)\\ =\left(3^2-1\right)\left(3^2+1\right)\left(3^4+1\right)....\left(3^{16}+1\right)\\ =\left(3^4-1\right)\left(3^4+1\right)....\left(3^{16}+1\right)\\ =\left(3^8-1\right)....\left(3^{16}+1\right)\\ =\left(3^{16}-1\right)\left(3^{16}+1\right)\\ =3^{32}-1\)
A = 8.(3² + 1)(3⁴ + 1)(3⁸ + 1)(3¹⁶ + 1)
= (3² - 1)(3² + 1)(3⁴ + 1)(3⁸ + 1)(3¹⁶ + 1)
= (3⁴ - 1)(3⁴ + 1)(3⁸ + 1)(3¹⁶ + 1)
= (3⁸ - 1)(3⁸ + 1)(3¹⁶ + 1)
= (3¹⁶ - 1)(3¹⁶ + 1)
= 3³² - 1