There is a fraction whose numerator minus 2 can be reduced to 1 / 2, and its denominator plus 1 can be reduced to 5 / 9 No equations

Let the numerator be x and the denominator be 2 (X-2)
x/2（x-2）+1=5/9
5（2x-3）=9x
10x-15=9x
x=15
Then the denominator is 2 (X-2) = 2 × 13 = 26
The original score was 15 / 26

If you add 1 to the denominator, a minimalist fraction can be reduced to 1 / 2. If you reduce 1 to the denominator, it can be reduced to 2 / 3. What is the fraction?

Let the original denominator be a and the numerator be B
So there is
b/a+1=1/2
b/a-1=2/3
A = 7, B = 4
The original score was 4 / 7 out of 7

The value of a fraction is 3 / 4 when 1 is added to the numerator and 1 / 2 when 1 is subtracted from the denominator?
A fraction, the numerator plus 1, is 3 / 5, and the denominator minus 1, is 4 / 7. What's the fraction? If you give an equation, you don't need to add points

This is a try. Multiply the numerator and denominator by 2, 3, 4, 5
3/5=6/10,(6-1)/10=1/2
3/5=9/15,(9-1)/15=8/15
4/7=8/14,8/(14+1)=8/15
The score is 8 / 15

If the numerator of a fraction remains unchanged and the denominator is reduced to one-half of its original value, the fraction will be ()
The size of a does not change, B expands 2 times, C shrinks 2 times, D cannot judge

B. For example, 1 / 4, the denominator becomes 2, which is 1 / 2.. 1 / 2 is twice 1 / 4

The numerator is reduced to 1 / 2 of the original, the denominator remains unchanged, and the fractional value ()

Method 1: exemplification method:
1 / 4 is the true fraction, the molecule shrinks to 1 / 2 of the original, becomes 1 / 8, and shrinks to half of the original
1 and 1 / 5 are band fractions, and the molecules are reduced to 1 / 2 of the original, 3 / 5, and half of the original
6 / 8 is the false fraction, and the molecule is reduced to 1 / 2 of the original, to 3 / 8, and to half of the original
So the score is reduced to half of its original value
Method 2
Let the fraction be x / y, and the molecule be reduced to 1 / 2 of its original value, which becomes X / 2 / y, which becomes X / 2Y, which becomes half of its original value

If the numerator of a fraction remains unchanged and the denominator is expanded 10 times, will the value of the fraction be reduced 10 times?

Yes

For a fraction, the sum of its numerator and denominator is 80, and the ratio of its numerator and denominator is 3:7?

3 + 7 = 10, 80 × 310 = 24, 80 × 710 = 56. The score is 2456 = 37. A: the score is 37

The sum of the numerator and denominator of a fraction is 80, and the sum of the numerator and denominator is 79______ ．

The ratio of fraction to denominator is 7:9, 7 + 9 = 16, 80 × 716 = 35, 80 × 916 = 45, so the fraction is 3545

A fraction, the numerator plus 1, is 3 out of 5, the denominator minus 1, is 3 out of 7. What's the fraction
The wrong number is: for a fraction, the numerator plus 1 is 3 out of 5, and the denominator minus 1 is 4 out of 7. What's the score

This number is 1 / (10 / 3). We need to use equations to solve it. Suppose the molecule is x and the denominator is y, we can get two equations. Formula 1: (x + 1) / y = 3 / 5. Formula 2: X / (Y-1) = 3 / 7. Let's find it by ourselves

If the numerator and denominator are all increased by 1, the fraction becomes 8 numerator 7. If the numerator and denominator are all decreased by 1, the fraction is 7 numerator 6. What is the original fraction

Let the numerator be x and the denominator be y (x + 1) / (y + 1) = 7 / 8 (x-1) / (Y-1) = 6 / 7, x = 13 and y = 15. The fraction is 13 / 15

There is a fraction whose numerator minus 2 can be reduced to 1 / 2, and its denominator plus 1 can be reduced to 5 / 9 No equations