A primary school math score problem, a math problem about fractions

Let the denominator of this fraction be x

Because adding one fractional unit to it is 1, the numerator is x-1 minus one fractional unit of its 7 8 i.e.

x-1）/x-1/x=7/8

x-2）/x=7/8

8（x-2)=7x

x = 16 This fraction is 15 16

From the meaning of the question, it can be seen that the sum of the two fractional units of the fraction = (1-7 8) = 1 8

So, a fractional unit is 1 16So the score is: (1-1 16) = 15 16

That's it.

Let the unit of this fraction be x, then the fraction is 1-x=x + seven-eighths so x=one-sixteenth.

So this score is fifteen out of sixteen.

This problem is to be solved by solving a system of equations in a binary way

Let the numerator of this fraction be x and the denominator be y, then we get:

x y+1 y=1 Equation 1.

x y-1 y=7 8 Equation 2.

Solving the system of equations gives x=15 y=16

So this score is 15 16

It's simple, haha.

Let the denominator be x and the numerator y

y/x+1/x=1 (1)

y/x-1/x=7/8 (2)

From (1) we get y x=1-1 x (3).

Bring (3) into (2) to get x=16

So y=15

15 16 It's not good to play the process, you just assume one by one, the score.

1/12+5/6

And so on The law is simple:

Splitting the numerator into two molecules, adding them to 11 and the denominator is still 12, gives two fractions, and then reduces the two fractions to get fractions with different denominators.

11 12 Subtract a fraction at will, a positive true fraction, the same denominator can also be turned into a different denominator, does the fraction have to be written in the simplest style?

If the two heterodenominator fractions are added and the sum is eleven twelve, then 12 is the least common multiple of the two heterodenominators, 1 2 and 5 12 1 3 and 7 12 2 3 and 1 4 1 6 and 3 4 5 6 and 1 12

Since it is a different denominator, then the least common multiple of the two bases should be 12, then include 2 , 6 , 1 , 12 , 3 , 4 and so on.

The answers are 1 2 and 5 12

1 6 and 3 4

1 4 and 2 3 and so on.

Let the original score be x y

x+y)/2y=10*x/y

y=19x, since this fraction is the simplest fraction.

So x=1, y=19

The original score was 1 19

The denominator becomes 2 times, and the fractional value becomes 10 times the original fraction, so the numerator becomes 20 times and increases by 19 times, that is, the denominator is 19 times the numerator, that is, 1 19

Let this minimum fraction be x y

So (x+y) 2y=10x y

x+y)/2=10x

y=19xx/y=1/19

52/39 is the simplest fraction: the numerator and denominator are divided by 13 to get 4/3;

The sum of the numerator and denominator of a fraction is 28, and after about two fifths, it is worth two-fifths

Numerator = 28 (5+2) multiplied by 2 = 8

Denominator = 28 (5+2) multiplied by 5 = 20

This score is 8 20

52/39

39 divided by 13) (52 divided by 13) = 4/3 of the numerator, then 2x + 5x = 28

x = 4 molecule is 2x = 8

The denominator is 5x=20

1) The greatest common factor of 39 and 52 is 13, so 39 13 52 13 = 3 4

2) The sum of the numerator and denominator of the fraction after reduction is several times smaller than the sum of the original numerator and denominator, which means that the fraction is divided by a few, because the multiple of the reduction is the same.

5 + 2 = 7, 28 7 = 4, indicating that 4 is used to divide the part. So the original fraction is 2x4 5x4=8 20

Fifty-two thirty-nineths, the numerator and denominator are divided by 13 = 428/3 times 5/7 = 20

28 times 2/7 = 8

A: This number is 5/4

1) The numerator and denominator are divided by 13 at the same time

2) Let 5x be the original denominator and 2x be the original numerator, then 7x=28 and x=4 then the original fraction is 8/20

Question 1: 39 52 divide by 13 to get 4 3

Second question: Because the fraction is about two-fifths, the numerator is equal to 5:2 with a denominator equal to 5:2, and the numerator is 5x and the denominator is 2x

So 5x+2x=7x=28

x=4, so this fraction is (4x5) (4x2)=20 8

Divide the numerator and denominator by 13 at the same time to get 4/3 28 (5+2)=4 4*2=8 4*5=20 8 20

52 39 = 52 divided by 13 39 divided by 13 equals 4 3 It is not good to divide by this symbol, which is represented by Chinese characters, that is, 39 and 52 are divided by 13 at the same time Ideas: Add 7 boxes, divide the boxes into 5 and 2, there are 28 apples in these 7 boxes, and the fruits in each box are the same, then there are 4 fruits in each box, similar to this question, these two numbers are 20 and 8That is, this fraction is 2 5 If this question is to find out what this number is, then write 2 5 directly You can write a fraction with the numerator and denominator multiplied or divided by a non-zero number at the same time, and this number does not change.