Those are not our books. Our books are in the schoolbag

Those are not our books. Our books are in the schoolbag

Those books are not ours.Ours are in our school bags.

We can't take these books out of the library

You can't take these books out of the library
These books are not allowed to take out of the library!

I like these books very much

I like (to read) these books very much

Logarithmic simplification
Simplification √ lg6lg6-4lg2lg3
√(lg6lg6-4lg2lg3)

LG6 = LG2 + Lg3, so lg6lg6 = (LG2 + Lg3) ^ 2 = (LG2) ^ 2 + 2lg2lg3 + (Lg3) ^ 2, so lg6lg6-4lg2lg3 = (LG2) ^ 2 + 2lg2lg3 + (Lg3) ^ 2-4lg2lg3 = (LG2) ^ 2-2lg2lg3 + (Lg3) ^ 2 = (lg3-lg2) ^ 2, so the original formula = lg3-lg2 = LG (3 / 2)

The value of expression 25.28 mod 6.99 is the calculation step_ -

25.28 mod 6.99
=25 mod 7
=4
Mod is used to find the remainder of the division of two integers. If it is a decimal, round it first, and then find the remainder

Where is the Three Gorges project located in China

The Three Gorges hydropower station, also known as the Three Gorges project, the Three Gorges Dam and the Three Gorges reservoir, is located on the main stream of the Yangtze River from Chongqing city to Yichang City, Hubei Province. The dam is located in Sandouping, Zigui County, in the Xiling Gorge of the Three Gorges project, and forms a cascade dispatching power station with the Gezhouba hydropower station not far downstream. It is the largest hydropower station in the world and the largest project ever constructed in China

When x → 0, Tan (x ^ 2 / 2) ~ 1-cosx proves (equivalent infinitesimal)
For example: arcsinx ~ x, let u = arcsinx, then x = sinu. We can only use the method similar to identity transformation to solve it, not any rule, because we haven't learned it yet

1-cosx = the square of 2sinx, using the first special limit, that is, when x → 0, sin (x ^ 2 / 2) / (x ^ 2 / 2) → 1, we can get the result

There are 50 students in class 61, of which the number of boys is 2 / 3 of that of girls. How many boys and girls are there in class 61
fast

If the number of female students is x, the number of male students is 2 / 3x
Female: x + 2 / 3x = 50
5/3x=50
X = 30 (person)
Male: 2 / 3 × 30 = 20
I'm a junior one student, believe me

A simple method is used to calculate 1 / 27 + 2 / 27 + 3 / 27 +. + 26 / 27 =?

1/27+2/27+3/27+.+26/27=?
=1/27（1+2+3+...+26）
=1/27[（1+26）*26/2]
=1/27*(27*13)
=13

In the arithmetic sequence with 2n + 1 terms, if the sum of all odd terms is 165 and the sum of all even terms is 150, then n is equal to ()
A. 9B. 10C. 11D. 12

From the odd number term and S1 = (n + 1) (a1 + A2N + 1) 2 = (n + 1) × 2An + 12 = (n + 1) an + 1 = 165, ① even number term and S2 = n (A2 + A2N) 2 = n × 2An + 12 = Nan + 1 = 150, ② n + 1n = 165150, the solution is n = 10