Respuesta:
Explicación paso a paso:
10. descomposición polémica
26 = 4n + 2
26-2 = 4n
24/4 = n
6 = n resp (b)
11. descomposición polémica
3*8² + a*8 + 5 = 245
3*64 + 8a = 240
8a = 240 - 192
a = 48/8
a = 6 resp (e)
12. el numero sera ab (pon una barrita encima)
ab = 8 (a+b)
10a + b = 8a + 8b
10a - 8a = 8b - b
2a = 7b
tanteo, si a=7 => 2*7 =7b => b=2
ab = 72 resp (a)
13.
a*7² + 5*7 + 3 = 1*5³ + a*5² + 1*5 + a
49a + 35 + 3 = 125 + 25a + 5 + a
49a - 25a - a = 125 + 5 - 35 -3
23a = 92
a = 4 resp (b)
14.
2*n + 3 + 5*n + 4 = 1*n²+1*n + 0
2n + 5n + 7 = n² + n
0 = n² - 6n - 7 aspa simple
n -7
n +1
(n - 7)(n + 1) = 0 => n= 7 o n = -1 NO!
resp (d)
15.
a < 8 b > 5 b < a
7,6,5,4 1 6,7,8,9
si a = 7 => b = 6
a + b = 13 resp (a)
16. =
3*x + 3 = 2(x+2) + 3
3x = 2x + 4
x = 4 resp (a)
17.
7m + p = 3(7p + m)
7m + p = 21p + 3m
4m = 20p
m = 5p único valor que cumple p=1 => m=5
m + p = 6 resp (e)
18.
n > 5 ; n < 7
=> n = 6 resp (d)
19. ab = 5(a+b)
10a + b = 5a + 5b
5a = 4b => b = 5 ; a = 4
45 suma 9 cinco veces 5*9 = 45
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Respuesta:
Explicación paso a paso:
10. descomposición polémica
26 = 4n + 2
26-2 = 4n
24/4 = n
6 = n resp (b)
11. descomposición polémica
3*8² + a*8 + 5 = 245
3*64 + 8a = 240
8a = 240 - 192
a = 48/8
a = 6 resp (e)
12. el numero sera ab (pon una barrita encima)
ab = 8 (a+b)
10a + b = 8a + 8b
10a - 8a = 8b - b
2a = 7b
tanteo, si a=7 => 2*7 =7b => b=2
ab = 72 resp (a)
13.
a*7² + 5*7 + 3 = 1*5³ + a*5² + 1*5 + a
49a + 35 + 3 = 125 + 25a + 5 + a
49a - 25a - a = 125 + 5 - 35 -3
23a = 92
a = 4 resp (b)
14.
2*n + 3 + 5*n + 4 = 1*n²+1*n + 0
2n + 5n + 7 = n² + n
0 = n² - 6n - 7 aspa simple
n -7
n +1
(n - 7)(n + 1) = 0 => n= 7 o n = -1 NO!
resp (d)
15.
a < 8 b > 5 b < a
7,6,5,4 1 6,7,8,9
si a = 7 => b = 6
a + b = 13 resp (a)
16.
= 
3*x + 3 = 2(x+2) + 3
3x = 2x + 4
x = 4 resp (a)
17.
7m + p = 3(7p + m)
7m + p = 21p + 3m
4m = 20p
m = 5p único valor que cumple p=1 => m=5
m + p = 6 resp (e)
18.
n > 5 ; n < 7
=> n = 6 resp (d)
19. ab = 5(a+b)
10a + b = 5a + 5b
5a = 4b => b = 5 ; a = 4
45 suma 9 cinco veces 5*9 = 45