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1 + 2/4 - 3/8 (Comun denominador 16)
[16(1) + 4(2) - 2(3)]/16 = [16 + 8 - 6]/16 = 18/16 = 9/8
[(2/3)*(1/6)/(1/2)]
(1/6)/(1/2) = (2x1)/(6x1) = 2/6 = 1/3
Ahora (2/3)*(1/3) = 2/9
(9/8)/(2/9) = 81/16
- 3 - 81/16
- 48/16 - 81/16 = -129/16
2)
(1 + 2 + 3)^(-1) = 6^(-1)
6^(-1) = 1/6
Ahora: 1^(-1) = 1
2^(-2) = 1/2² = 1/4
3^(-3) = 1/3³ = 1/27
1 + 1/4 + 1/27 = [108(1) + 27(1) + 4(1)]/(108) = (108 + 27 + 4)/108
139/108
Quedaria: (139/108)/(1/6) = (139x6)/(108x1) = 834/108 = 139/18
Rta: 139/18
3) (2/5)^(-2) + 1/(4^(-2)) + (2/7)^(-3)
(2/5)^(-2) = 1/(2/5)^2 = 1/[4/25] = 25/4
1/(4^(-2)) = 1/(1/4²) = 4² = 16
(2/3)^(-3) = 1/(2/3)³ = 1/(8/343) = 343/8
(25/4) + 16 + (343/8)
Comun denominador 16
[4(25) + 16(16) + 2(343)]/16 = [100 + 256 + 686]/16 = 1042/16 = 521/8
Rta: 521/8