Explicación paso a paso:
09.
12 (4) 10 → 12 - 10 = 2 → 2² = 4
15 (49) 8 → 15 - 8 = 7 → 7² = 49
20 (X) 10 → 20 - 10 = 10 → 10² = 100
X = 100
10.
42 (38) 34 → 42 + 34 = 76 → 76/2 = 38
15 (20) 25 → 15 + 25 = 40 → 40/2 = 20
18 (X) 70 → 18 + 70 = 88 → 88/2 = 44
X = 44
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Explicación paso a paso:
09.
12 (4) 10 → 12 - 10 = 2 → 2² = 4
15 (49) 8 → 15 - 8 = 7 → 7² = 49
20 (X) 10 → 20 - 10 = 10 → 10² = 100
X = 100
10.
42 (38) 34 → 42 + 34 = 76 → 76/2 = 38
15 (20) 25 → 15 + 25 = 40 → 40/2 = 20
18 (X) 70 → 18 + 70 = 88 → 88/2 = 44
X = 44