How to add a sign of 4 5's equal to 2

How to add a sign of 4 5's equal to 2

5/5+5/5=2

What is the maximum value of the formula formed by filling each of the four symbols of ＋, -, ×, / into the four symbols of 17 □ 17 □ 17 □ 17?

17 & # 10008; 17 + 17-17 divided by 17

Fill in one "+", "-", "×" and "△" operation symbols in the four □ "of 17 □ 17 □ 17 □ 17. The maximum value of the formula is______ ．

Because the subtraction sign can only be used once, and the subtraction cannot be 0, then when 17 △ 17 = 1 is used as the subtraction, the result of the operation is the largest: 17 × 17 + 17-17 △ 17, = 289 + 17-1, = 305

Fill in one "+", "-", "×" and "△" operation symbols in the four □ "of 17 □ 17 □ 17 □ 17. The maximum value of the formula is______ ．

Because the subtraction sign can only be used once, and the subtraction cannot be 0, then when 17 △ 17 = 1 is used as the subtraction, the result of the operation is the largest: 17 × 17 + 17-17 △ 17, = 289 + 17-1, = 305

Fill the four operation symbols of + - x △ into the formula 1 / 2 () 1 / 3 () 1 / 4 () 1 / 5 () 1 / 6 respectively, then the maximum value is
I'll offer you a reward if you like

The operation of addition, subtraction, multiplication and division has sequence, multiplication and division first and then addition and subtraction
For decimals, the smaller the multiplication, the larger the division
These numbers divide by 1 / 2, divide by 1 / 3, and 1 / 5 * 1 / 6, respectively
/,+,-,*

Add the operation symbol in the formula to make the equation hold
1 2 3=1 1 2 3 4=1 1 2 3 4 5=1 1 2 3 4 5 6=1 1 2 3 4 5 6 7=1

(1+2)/3=1
1*(2+3-4)=1
1*2/(3+4-5)=1
1*(2+3-4+5)/6=1
1*（2+3+4+5-6-7）=1
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Fill in the operation symbols in the formula, and the brackets make the equation hold 9 () 9 () 9 () 9 = 7

9-（9+9）÷9
9-18÷9
9-2
=7

The first n terms of sequence {an} and Sn = 1-5 + 9-13 + 17-21 +... + (- 1) ^ n-1 * (4n-3), then what is the value of S15 + s22-s31?

When n is even, Sn = - 2n
When n is odd, Sn = 2N-1
S15＋S22－S31=2*15-1+(-2*22)-[2*31-1]
=29-44-61=-76

If we know the first n terms and Sn = 1-5 + 9-13 + 17-21 +... + (- 1) ^ (n-1) × (4n-3), then S15 + s22-s31 =?

When n is even, Sn = - 4N / 2 = - 2n
When n is odd, Sn = - 4 (n-1) / 2 + 4n-3 = 2N-1
So S15 + s22-s31 = 2 * 15-1-2 * 22-2 * 31 + 1 = - 76

1 / 5,3 / 9,5 / 13,7 / 17,9 / 21.11/25; 1 / 12,1 / 6,1 / 4,1 / 3,5 / 12,1 / 2
How many?

Item 49 is 97 / 197 and item 100 is 199 / 401
The general term is (2n-1) / (4N + 1)