A simple mathematical problem of simplification (2 + 3) / (3 + 3) can be changed into (1 + 2 / 3) / (1 + 3 / 3). How is this changed

Divide the score by three at the same time

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1. Molecules are: (1 and 2 / 3) + (2 and 3 / 4) + (3 and 4 / 5) + +(1997 of 1996 and 1998) + (1998 of 1997 and 1999) The denominator is: 5 + (8 and 1 / 4) + (11 and 2 / 5) + +(5990 1995 / 1998) + (5993 1996 / 1999)
2. 3 to the power of 2010 + 5 * (negative 3) to the power of 2009 + 6 * 3 to the power of 2008 - 2010 * 9 (negative 1) to the power of 2007
3. 1482 / (41 * 13-514) if you want to take off the formula, it's the same as the next one
4. How to multiply it by 9 in 2009
5. A math problem, help me see how to calculate When a person is 20 years old, he starts to save 6000 yuan a year. Assuming that the annual interest rate is 3%, he can save until he is 40 years old. How much money can he get when he is 60 years old? Is there any knowledge about sequence involved? I forgot, please give me some advice
6. Electronic calculator has the characteristics of small volume, light weight and easy to carry______ ．
7. Mathematical problems (simple calculation, 1 1-2+3-4+5…… +101 2 498 by 498-499 by 497 3 26.04 - (4.35 divided by 1.5 + 0.9) multiplied by 4.2 4 3.01-0.25 times 0.4 divided by 0.25 times 0.4
8. It is necessary to simplify the calculation process 375×12÷375×12 159×64＋27×159＋（200－41）×9
9. How to simplify and calculate () 1、4/9×[3/4-（7/16-1/4）] 2、（3/4-3/5×5/6）÷（5/8+1/3） 3、1/2÷15×5/6÷3/4 4、[1-（1/12+1/24）×6]÷1/24 5、4/9÷[4/5-（1/5+1/3）] 6、7.8÷[3.2×（1-5/8）+3.6] 7、2/3-3/4×4/11+1/3÷3/7 8、8/9÷[（2/5+1/10）×4/3] 9、18×0.25=12×1/4+2.5 10、[1/2-（3/4-3/5）]÷7/10 11、5÷5/7-5/7×1/5 11、4/9×[3/4-（7/16-1/4）] 12、3/4×6/7+（1-3/4）×6/7 13、1/3×1/2+5/4×2/5
10. There are 100 pieces of sugar. One for the first time and two for the second time. How many times can you add one more piece of sugar to each time? The main question is how to calculate?
11. A math problem. Simplify first, then calculate [(2x+y)²-y(y+4x)-8x]/2x x=10
12. 49 times 9 / 50 (/ is a fractional line) must be a process
13. One third plus one sixth plus one tenth plus one fifteenth plus one twenty-one plus one twenty-eight plus one thirty-six plus one forty-five One fifty-five and one sixty-six is equal to?
14. 1 / 3 + 1 / 6 + 1 / 10 + 1 / 15 + 1 / 21 + 1 / 28 + 1 / 36 + 1 / 45 are calculated by simple method
15. One plus one third plus one sixth plus one tenth plus one fifteenth plus one twenty-one plus one twenty-eight plus one thirty-six What's one in forty-seven?
16. Find out the law of 1,3,6,10,15,21,28,36 and the law of 0,1,3,6,10,15,21
17. Divide 30, 42, 55, 66, 78 and 91 into two groups to make the product of each group equal
18. Find the rule: 45, 55, 66, 78, -, -, 120, 136
19. Calculation: 13 + 16 + 110 + 115 + 121 + 128 + 136 + 145=______ ．
20. It's a very difficult calculation problem, simple calculation (123456 + 234561 + 345612 + 456123 + 561234 + 612345) what is 7,