23 −1
7

Step 1

We can"t subtract two fractions with different denominators. So you need lớn get a common denominator. To vị this, you"ll multiply the denominators times each other... But the numerators have to change, too. They get multiplied by the other term"s denominator.

Bạn đang xem: 2 3 1 7

So we multiply 2 by 7, và get 14.

Then we multiply 1 by 3, and get 3.

Next we give both terms new denominators -- 3 × 7 = 21.

So now our fractions look like this:

14
21
−3
21

Step 2

Since our denominators match, we can subtract the numerators.

14 − 3 = 11

So the answer is:

11
21

Step 3

Last of all, we need lớn simplify the fraction, if possible. Can it be reduced khổng lồ a simpler fraction?

To find out, we try dividing it by 2...

Nope! So now we try the next greatest prime number, 3...

Nope! So now we try the next greatest prime number, 5...

Nope! So now we try the next greatest prime number, 7...

Nope! So now we try the next greatest prime number, 11...

Nope! So now we try the next greatest prime number, 13...

Xem thêm: Bộ Câu Hỏi Trắc Nghiệm Kinh Tế Vi Mô Chương 1 6, Trắc Nghiệm Kinh Tế Vi Mô Chương 1,6

No good. 13 is larger than 11. So we"re done reducing.

There you have it! The final answer is:2
3
−1
7
=11
21

1/7 + 1/2
1/7 - 1/2
1/7 + 1/3
1/7 - 1/3
1/7 + 2/3
1/7 - 2/3
1/7 + 1/4
1/7 - 1/4
1/7 + 2/4
1/7 - 2/4
1/7 + 3/4
1/7 - 3/4
1/7 + 1/5
1/7 - 1/5
1/7 + 2/5
1/7 - 2/5
1/7 + 3/5
1/7 - 3/5
1/7 + 4/5
1/7 - 4/5
1/7 + 1/6
1/7 - 1/6
1/7 + 2/6
1/7 - 2/6
1/7 + 3/6
1/7 - 3/6
1/7 + 4/6
1/7 - 4/6
1/7 + 5/6
1/7 - 5/6
1/7 + 1/7
1/7 - 1/7
1/7 + 2/7
1/7 - 2/7
1/7 + 3/7
1/7 - 3/7
1/7 + 4/7
1/7 - 4/7
1/7 + 5/7
1/7 - 5/7
1/7 + 6/7
1/7 - 6/7
1/7 + 1/8
1/7 - 1/8
1/7 + 2/8
1/7 - 2/8
1/7 + 3/8
1/7 - 3/8
1/7 + 4/8
1/7 - 4/8
1/7 + 5/8
1/7 - 5/8
1/7 + 6/8
1/7 - 6/8
1/7 + 7/8
1/7 - 7/8
1/7 + 1/9
1/7 - 1/9
1/7 + 2/9
1/7 - 2/9
1/7 + 3/9
1/7 - 3/9
1/7 + 4/9
1/7 - 4/9
1/7 + 5/9
1/7 - 5/9
1/7 + 6/9
1/7 - 6/9
1/7 + 7/9
1/7 - 7/9
1/7 + 8/9
1/7 - 8/9
1/7 + 1/10
1/7 - 1/10
1/7 + 2/10
1/7 - 2/10
1/7 + 3/10
1/7 - 3/10
1/7 + 4/10
1/7 - 4/10
1/7 + 5/10
1/7 - 5/10
1/7 + 6/10
1/7 - 6/10
1/7 + 7/10
1/7 - 7/10
1/7 + 8/10
1/7 - 8/10
1/7 + 9/10
1/7 - 9/10
1/7 + 1/11
1/7 - 1/11
1/7 + 2/11
1/7 - 2/11
1/7 + 3/11
1/7 - 3/11
1/7 + 4/11
1/7 - 4/11
1/7 + 5/11
1/7 - 5/11
1/7 + 6/11
1/7 - 6/11
1/7 + 7/11
1/7 - 7/11
1/7 + 8/11
1/7 - 8/11
1/7 + 9/11
1/7 - 9/11
1/7 + 10/11
1/7 - 10/11
1/7 + 1/12
1/7 - 1/12
1/7 + 2/12
1/7 - 2/12
1/7 + 3/12
1/7 - 3/12
1/7 + 4/12
1/7 - 4/12
1/7 + 5/12
1/7 - 5/12
1/7 + 6/12
1/7 - 6/12
1/7 + 7/12
1/7 - 7/12
1/7 + 8/12
1/7 - 8/12
1/7 + 9/12
1/7 - 9/12
1/7 + 10/12
1/7 - 10/12
1/7 + 11/12
1/7 - 11/12