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This book can be kept for three weeks
This book can be borrowed for three weeks
Do you like any other books
That's it. Thank you_ ∩)O~
Do you like any other books?
What kind of books do children like
what kind of books do children like
9 out of 13 (9 out of 13 minus 2 out of 11) defecation
9 out of 13 minus 2 out of 11
=（9/13-9/13）+2/11
=2/11
Mr. Zhang bought four copies of "interesting mathematics" and "Story King" respectively, paid 20 yuan, and recovered 7.6 yuan. Each copy of "interesting mathematics" costs 1.6 yuan, and how much is each copy of "Story King"?
(20-7.6-1.6 × 4) △ 4 = (20-7.6-6.4) △ 4 = 16 △ 4 = 4 (yuan); answer: 4 yuan for each story king
There are 1, 5, 14, 30, 55 and so on. How to use n to express the rule of this row?
Observe the following group of data: 5, 14, 30, 55, etc. according to the above data, the nth number can be expressed as --?
How did you get the answer,
Although I know the correct answer, I can't understand one step. Is there a more detailed explanation
n×（n+1）×（2n+1）/6
The calculation process is as follows:
a2-a1=5-1=2^2;
a3-a2=14-5=3^2;
a4-a3=30-14=4^2;
.....
an-an-1=n^2;
By adding the above formulas, we can get:
an-a1=2^2+3^2+...+n^2;
So an = a1 + 2 ^ 2 + 3 ^ 2 +... + n ^ 2 = 1 ^ 2 + 2 ^ 2 + 3 ^ 2 +... + n ^ 2=
n(n+1)(2n+1)/6
It's the last step of calculation. I can't understand 1 ^ 2 + 2 ^ 2 + 3 ^ 2 +... + n ^ 2=
N (n + 1) (2n + 1) / 6 I don't know which grade it is,
n^2+(n-1)^2+.+1^2
How to write 1.7x + o.5x = 4.4 checking calculation? After thinking about it for a long time, I still can't think of it! Please be an expert!
We have to solve this equation first
1.7X+0.5X＝4.4
The solution is x = 2
checking calculation
1.7×2+0.5×2
＝3.4+1
＝4.4
If your composition is published in the newspaper
Happy, overjoyed, overjoyed, with a knowing smile, hiding but not revealing... Happy, overjoyed, overjoyed, overjoyed
How many jin is 2100 kg,
1kg = 0.5kg, so 2100Kg is 4200kg
How to calculate 85 times 86
How to calculate 85 times 86
=（86-1）×(5/86)
=5-5/86
=4+81/86;
=4 and 81 / 86;
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