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In a subtraction, the sum of the subtracted, the subtracted and the difference is 90 and the difference is 18（ The first half of the second year's holiday, how to do? How to explain to the students in this grade? They have not learned the equation
Subtracted - subtracted = difference
Subtracted - subtracted = 18
Subtracted + subtracted + difference = 90
Subtracted + subtracted = 72
Subtracted + subtracted - (subtracted subtracted) = 72-18 = 54
Subtracted + subtracted - subtracted + subtracted = 54
Subtraction + subtraction = 54
Subtraction = 27
2.5.9.14.12.13 use these numbers to do one addition and one subtraction, which cannot be repeated
For example: 5 + 6 + 7 = 1 + 8 + 9, where the odd number is four, 5 + 6 = 4 + 7, the odd number is two, you give three odd numbers, I can't do it!
Fill 1, 2, 3, 4, 5, 6, 7 and 8 in the boxes of the following two formulas respectively to make the sum of the addition formula the largest and the difference of the subtraction formula the smallest
(the format of the first line is x.xxx + x.xxx)
(second line: x.xxx-x.xxx)
If negative numbers are involved, they are:
8.642+7.531=16.173
1.234-8.765=-7.531
If negative numbers are not involved, they are:
8.642+7.531=16.173
5.123-4.876=0.247
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