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1. (- two fifths) - (- three fifths) 2. One half one third 3 4. - two thirds - (- one sixth) 5.0 - (- three fourths) 6. (- 2) - (+ two thirds) 7. (- 16 and 3 / 4) - (- 10 and 1 / 4) - (+ 1 / 2) 8. - 4.2 + 5.7 - 8.4 + 10.9. - one quarter + five sixths + two thirds - one half
(- two fifths) - (- three fifths)
=-2/5+3/5
=1/5
Half to one third
=1/6
3. (- half) - one third
=-1/2-1/3
=-5/6
4. - two thirds - (- one sixth)
=32/208-13/208
=19/208
5.0 - (- three quarters)
=0+3/4
=3/4
6. (- 2) - (+ two thirds)
=-2-2/3
=-Two and two thirds
7. (- 16 and 3 / 4) - (- 10 and 1 / 4) - (+ 1 / 2)
=16 + 3 / 4 + 10 + 1 / 4-1 + 1 / 2
=27-1 and 1 / 2
=25 and 1 / 2
8.－4.2+5.7－8.4+10
=1.5+1.6
=3.1
9. - 1 / 4 + 5 / 6 + 2 / 3 - 1 / 2
=1/14+（10/12+8/12-6/12）
=1/14+1
=1 and 1 / 14
RELATED INFORMATIONS
- 1. You mathematical experts help! Half, one third, two fifths, three eighths, five thirteenth, eight twenty-one fill out the last two
- 2. It is proved by limit that if the limit of XN is a, then for any natural number k, the limit of XN + k is a
- 3. Let the square number y ^ 2 be the sum of the squares of 11 consecutive integers, and find the minimum value of Y It's the sum of squares! It's not the sum of squares
- 4. A is a non-zero natural number. The largest number in the following formula is () A.A × 3 / 5 B.A △ 3 / 5 C.A △ 8 / 5
- 5. A is a natural number greater than 0. The largest number in the following formula is () A is a natural number greater than 0. The largest number in the following formula is () A.A divided by four fifths B.A multiplied by four fifths C.A divided by one and four fifths
- 6. A. B and C are all non-zero natural numbers. The following can show that the formula of a > b is () A.A △ 1 B.A / C1
- 7. A is a non-zero natural number. The largest number in the following formula is () A. A÷25B. A×25C. A÷125
- 8. Let n denote an integer, and use the formula containing n to denote: (1) any even number; (2) any odd number
- 9. Primary school mathematics defines "in the natural number, what can be divided by 2 is even, what cannot be divided by 2 is odd". Now it is stipulated that there are odd and even numbers in negative integers
- 10. Let a and n be positive integers, and a divide by 2n ^ 2. Try to explain that n ^ 2 + A is not an answer before the square number,
- 11. 1/2*1+1/2*3+1/3*4+.+1/2004*2005=?
- 12. Quarter and three eighths
- 13. One half, six seventh, two-thirds of these three numbers to compare again, please
- 14. How to calculate 1 - (one sixth - one seventh) + one sixth
- 15. How much more is the difference between 7 and 7 / 10 than 4 / 5
- 16. -What is the sum of - 1 / 2 and 1 / 6? 1 + (- 2) + 3 + (- 4) + 5 + (- 6) +. + 99 + (- 100)= -1 / 60 ÷ (1 / 3 + 1 / 4-1 / 5) = (0.123) to the 5th power * the 4th power of 8=
- 17. There are 46 students in class 6 (1) of hope primary school. Class 6 (2) has two more students than one third of the whole grade. The total number of these two classes accounts for 5 / 7 of the whole grade,
- 18. Two thirds of a number is four times more than two thirds of thirty
- 19. One third of a number is 30 less than 50% of 120. Find the number
- 20. 25 of a number is exactly 23 of 50. This number is______ ．