Electronic calculator has the characteristics of small volume, light weight and easy to carry______ ．

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• 1. 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
• 2. It is necessary to simplify the calculation process 375×12÷375×12 159×64＋27×159＋（200－41）×9
• 3. 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
• 4. 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?
• 5. Simple calculation of mathematical problems! 1+2-3-4+5+6-7-8+9+10-11-12…… -1999-2000+2001+2002-2003-2004+2005+2006 Also, simple calculation: 222222 * 5555
• 6. Simple mathematical problems Simple calculation of 1050 divided by 70
• 7. Question 1: 33333 * 66666 Question 2: 1997 * 1998 1998-1998 * 1997 1997 1997 Question 3: 1 * 2 / 1 + 2 * 3 / 1 + 3 * 4 / 1 +99 * 1 / 100 Question 4: (7 / 4 - 7 / 8 - 7 / 12) * ([minus sign] 8 / 7) Question 5: the square of (- 3) * [(- 2 / 3) + (- 5 / 9)] Question 6: (5 / 9 - 5 / 6 + 1 / 4) divided by (- 1 / 36) Question 7: (- 19 and 18 / 19) * 38
• 8. Is there the largest positive number and the smallest negative number in rational numbers? Are there the largest negative integers and the smallest positive integers in rational numbers? If so, please write them out Please give an example
• 9. 3/(2*5)+3/(5*8)+3/(8*11)+…… +3/(1994*1997*) 1 and 1 / (3 * 5) + 2 and 1 / (5 * 7) + 3 and / (7 * 9) + +100 and 1 / (201 * 203) 1/（1*3）+1/（3*5）+1/（5*7）+…… +1/（97*99）+1/（99*101） I already can You did something wrong
• 10. Xiao Hong drinks a cup of milk and drinks it in four times. The first time, she drinks 16% of the milk and then fills it with water; the second time, she drinks 13% of the milk and then fills it with water; the third time, she drinks half a cup and then fills it with water; the fourth time, she drinks it all in one gulp. Does Xiao Hong drink more milk or more water? What do you think?
• 11. 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
• 12. How to multiply it by 9 in 2009
• 13. 1482 / (41 * 13-514) if you want to take off the formula, it's the same as the next one
• 14. 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
• 15. 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)
• 16. A simple mathematical problem of simplification (2 + 3) / (3 + 3) can be changed into (1 + 2 / 3) / (1 + 3 / 3). How is this changed
• 17. A math problem. Simplify first, then calculate [(2x+y)²-y(y+4x)-8x]/2x x=10
• 18. 49 times 9 / 50 (/ is a fractional line) must be a process
• 19. 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?
• 20. 1 / 3 + 1 / 6 + 1 / 10 + 1 / 15 + 1 / 21 + 1 / 28 + 1 / 36 + 1 / 45 are calculated by simple method