Four arithmetic problems 250 channels, including four operations of integer, decimal, fraction and percentage

Four arithmetic problems 250 channels, including four operations of integer, decimal, fraction and percentage

1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -（ 3/2 + 4/5 ） 8. 7/8 + （ 1/8 + 1/9 ） 9. 9 × 5/6 + 5/6 ...

How to do the following five four arithmetic problems,
A. 1 and 3 / 25 + [(1.5 + 2 and 2 / 3) △ 3 and 3 / 4-0.4] + 8 and 8 / 9
B. [(15 / 28-11 / 36) × 21 / 29 + 6 and 2 / 7 △ 16 / 21] / / 16 and 1 / 2
C. 1 - [(2 1 / 2-1 1 / 3) △ 1 1 1 / 6] / / 4 1 / 2 + 2 1 / 3
D.[1÷(3.1-3.09)]÷(1/3+0.8+8/15)
E.1998×1999-1995×2002

A. 1 and 3 / 25 + [(1.5 + 2 and 2 / 3) × 3 and 3 / 4-0.4] + 8 and 8 / 9 = 28 / 25 + [(9 / 6 + 16 / 6) × 15 / 4-0.4] + 80 / 9 = 28 / 25 + [(9 / 6 + 16 / 6) × 15 / 4-0.4] + 80 / 9 = 28 / 25 + [10 / 9-10 / 25] + 80 / 9 = 10 + 18 / 25 = 10 and 18 / 25B

What are the formulas of geometric figures?

Primary school to junior high school mathematics all formula 1, each number x copies = the total number of copies ／ each number = the total number of copies ／ copies = each number 2, 1 multiple x multiple = several times several times ／ 1 multiple = several times ／ multiple = 1 multiple 3, speed x time = Road