Now I am not very busy

Now I am not very busy

I am not busy now

But I like to use English now

But i like now

Interesting math stories
Interesting math story and tell the truth
Want more, whose most still add a mark! If did not say reason not calculate!

Find the rules and fill in the blanks 3 5 14 55 274 () 11500
one thousand six hundred and forty-three

5=3*2-1
14=5*3-1
55=14*4-1
274=55*5-1
1643=274*6-1
11500=1643*7-1
The answer is 1643

If the absolute value of 5x-3 is equal to 3x-5, what is the planting range of X

x=+-0.686

With the help of the teacher, the wrong sentences in my composition have improved greatly

With the help of the teacher, the number of sick sentences in my composition has been greatly reduced

How much is 75 grams

One kilo is 500 grams
Divide 75 by 500 to get 0.15 Jin

(67.85-11.5 * 0.0) / 5.75 simple calculation 40% * (9.5 + 9.5 + 9.5 + 9.5 + 9.5)

40%*(9.5+9.5+9.5+9.5+9.5)
＝40%*5*9.5
＝2*9.5
＝19

Xiao Ming calculated 15 questions, 8 points for one right question, 3 points for one wrong question, 76 points for the result, how to do several right questions

Let X be right, 8 * x-3 * (15-x) = 76
X = 11
So that's right, 11

All odd numbers except 1 are given 2003 brackets according to 1 2 3 4 cycle groups (3) (57) (9 11 13) (15 17 19 21)
All odd numbers except 1 are divided into 1 2 3 4 cycles (3) (5 7) (9 11 13) (15 17 19 21);

Let's look at the leftmost number in brackets
3,5,9,15,23...
5-3=2
9-5=4
15-9=6
23-15=8
...
therefore
an=3+n(n-1)
So the leftmost number in the 2003 bracket is
=3+2003*(2003-1)
=4010009
The leftmost number of the 2004 bracket is
=3+2004*(2004-1)
=4014015
So the rightmost number in the 2003 bracket is
4014015-2
=4014015
So the number in the 2003 bracket is
(401009,401011,401013,...,4014011,4014013,4014015)