Please use the four numbers 2347 and the decimal point to form two, because a small number, the sum of the calculation results, can you divide this matter into several categories

Please use the four numbers 2347 and the decimal point to form two, because a small number, the sum of the calculation results, can you divide this matter into several categories

We can use the four numbers 2, 3, 4 and 7 to form two two digit numbers, take 2 and 3 to form 23 and 32, and 4 and 7 to form two two digit numbers 47 and 74
These four two digit numbers can form four addition formulas, 23 + 47, 23 + 74, 32 + 47, 32 + 74, thus four one digit decimal addition formulas can be obtained: 2.3 + 4.7, 2.3 + 7.4, 3.2 + 4.7, 3.2 + 7.4,
In the same way, 2 and 4 can be divided into a group, 3 and 7 into a group; 2 and 7 into a group, 3 and 4 into a group
2,3 group, 4,7 group: 2.3 + 4.7 = 7,2.3 + 7.4 = 9.7,3.2 + 4.7 = 7.8,3.2 + 7.4 = 10.6,
2,4 group, 3,7 group: 2.4 + 3.7 = 6.1,2.4 + 7.3 = 9.7,4.2 + 3.7 = 7.9,4.2 + 7.3 = 11.5,
2,7 group, 3,4 group: 2.7 + 3.4 = 6.1,2.7 + 4.3 = 7,7.2 + 3.4 = 10.6,7.2 + 4.3 = 11.5
The first step in classification is to choose the standard. Different standards have different classification methods
The same number can be divided into six categories, each with two formulas
And 5.2
And 7
And 7.9
And 9.7
And 11.5
And 10.6
2.4+3.7=6.1
2.7+3.4=6.1
2.3+4.7=7
2.7+4.3=7
3.2+4.7=7.9
4.2+3.7=7.9
2.3+7.4=9.7
2.4+7.3=9.7
4.2+7.3=11.5
7.2+4.3=11.5
3.2+7.4=10.6
7.2+3.4=10.6
If the result is more than 10, it can be divided into one class, if the result is less than 10, it can be divided into another class. If the result is more than 10, there are four formulas, and if the result is less than 10, there are eight formulas
The results were more than 10
The result is less than 10
4.2+7.3=11.5
7.2+4.3=11.5
3.2+7.4=10.6
7.2+3.4=10.6
2.4+3.7=6.1
2.7+3.4=6.1
2.3+4.7=7
2.7+4.3=7
3.2+4.7=7.9
4.2+3.7=7.9
2.3+7.4=9.7
2.4+7.3=9.7
According to the classification of carry and carry, there are four formulas for carry and eight formulas for carry
Carry addition
Add without carry
2.4+3.7=6.1
2.7+3.4=6.1
2.3+4.7=7
2.7+4.3=7
4.2+7.3=11.5
7.2+4.3=11.5
3.2+7.4=10.6
7.2+3.4=10.6
3.2+4.7=7.9
4.2+3.7=7.9
2.3+7.4=9.7
2.4+7.3=9.7