What's in the brackets of mathematical reasoning questions 4,8 / 9,16 / 27, (), 36 / 125, 216 / 49

What's in the brackets of mathematical reasoning questions 4,8 / 9,16 / 27, (), 36 / 125, 216 / 49

In the bracket is 64 / 25
Analysis of 2 ^ 2 / 1 ^ 3,3 ^ 2 / 2 ^ 3,4 ^ 2 / 3 ^ 3,5 ^ 2 / 4 ^ 3,6 ^ 2 / 5 ^ 3,7 ^ 2 / 6 ^ 3
Reverse the number of positions 2,4,6,8

Fill in the number according to the rule: 1 / 2,1 / 3,2 / 5,3 / 8,),), 21 / 55

Fill in the numbers according to the rules: 1 / 2, 1 / 3, 2 / 5, 3 / 8, (5 / 13), (8 / 21) (13 / 34), 21 / 55
The latter term of numerator and denominator is the sum of the first two terms respectively
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(1) Find the rule - 2,2,0, - 2,2__ ,__… （2）2,-5,7,-
(1) Find the rule - 2,2,0, - 2,2__ ,__…
(2) 2, - 5,7, - 13 to calculate 24 points

Two simple math problems
(1) Find the law - 2,2,0, - 2,2,0, - 2
(2) 2, - 5,7, - 13 to calculate 24 points
1.\x092－[﹙7×-5﹚－-13]
2.\x09[-13－﹙7×-5﹚]＋2
3.\x09[-13－﹙-5×7﹚]＋2
4.\x09[2－﹙7×-5﹚]＋-13
5.\x09-13－[﹙-5×7﹚－2]
6.\x092＋[-13－﹙7×-5﹚]
7.\x09-13＋[2－﹙-5×7﹚]
8.\x092＋[-13－﹙-5×7﹚]
9.\x09[2－﹙-5×7﹚]＋-13
10.\x09﹙-13＋2﹚－﹙-5×7﹚
11.\x09﹙-13＋2﹚－﹙7×-5﹚
12.\x09-13－[﹙7×-5﹚－2]
13.\x09-13＋[2－﹙7×-5﹚]
14.\x09﹙2＋-13﹚－﹙-5×7﹚
15.\x09﹙2＋-13﹚－﹙7×-5﹚
16.\x092－[﹙-5×7﹚－-13]