How to write the English words of English, sports and art?

Chinese, maths, English, physics, chemistry, biology, politics, history, geography, sports, art

It's better to write down your learning experience and learning methods!
How to calm down?

When reading, even if you don't like it, you should stick to it. To form a good habit is to force yourself. Slowly, you will read quietly. Come on! Listen carefully in class, write your homework carefully, and digest the knowledge of the day. If you don't understand it, you can solve it immediately. Otherwise, the problems will only accumulate more and more

What is the maximum value of X + y = 2 logx + log?

0, if and only if x = y = 1

If the top angle of isosceles triangle is 120 ° and the height on the bottom is 3cm, the waist length is______ cm．

As shown in the figure, ab = AC, ad ⊥ BC is at the point D, ad = 3cm, ∠ BAC = 120 °, ∫⊥ BAC = 120 °, ab = AC ∫ B = ∠ C = (180 ° - ⊥ BAC) △ 2 = 30 ° ∫ ad ⊥ BC ∫ AB = 3 △ 12 = 6cm

How much voltage can 220 V voltmeter measure directly?

This depends on what kind of voltmeter you are talking about. Some are clamp type voltmeters, some are pointer type voltmeters, and some are digital ones. Different voltmeters have different measuring ranges. I don't know about the meters of other manufacturers. We produce b600 digital voltmeters with standard input of 220 V, which can directly measure the voltage of 0-600 v. if it exceeds this range, add a voltage transformer, That is high voltage. High voltage standard input is unified in China, 100V

What is the number of different sets m that satisfy the condition that {a} is really contained in M and contained in {a, B, C, D}?

There are seven
{a,b}
{a,c}
{a,d}
{a,b,c}
{a,b,d}
{a,c,d}
{a,b,c,d}

As shown in the figure, AC ⊥ CB, DB ⊥ CB, ab = DC are known

How to prove that the rank of matrix sum does not exceed the sum of matrix rank

Let the matrix be m × n, a = [α 1, α 2 αn],B=[β1,β2,…… ,βn]
Then a + B = [α 1 + β 1, α 2 + β 2 αn+βn]
r(A+B)=r(α1+β1,α2+β2,…… αn+βn)
α1+β1,α2+β2,…… α n + β n can be divided into α 1, α 2 αn,β1,β2,…… β n is linear;
therefore
r(A+B)≤r(α1,α2,…… αn,β1,β2,…… ,βn)≤r(α1,α2,…… αn)+r(β1,β2,…… ,βn)=r(A)+r(B)
So: R (a + b) ≤ R (a) + R (b)

1. There are 1,2,4 divisors of 4 and 1,2,3,4,6,12 divisors of 12. How many divisors of 4 times 12?
1. There are 1,2,4 divisors of 4 and 1,2,3,4,6,12 divisors of 12. How many divisors of 4 times 12?
2. What is the largest four digit number with a divisor 7?
3. Given that the natural number n has only two divisors, how many divisors does 5N have?
4. In natural numbers 1 ~ 100, the divisors of all composite numbers are the common divisors of odd numbers

1. There are 1,2,4 divisors of 4 and 1,2,3,4,6,12 divisors of 12. How many divisors of 4 times 12?
4 * 12 = 2 ^ 4 * 3 has (4 + 1) * (1 + 1) = 5 * 2 = 10
2. What is the largest four digit number with a divisor 7?
[10000/7]*7 = 9996
3. Given that the natural number n has only two divisors, how many divisors does 5N have?
The natural number n has only two divisors, which means that n is prime
If n = 5, then there are three divisors, 1,5,25
If n is not equal to 5, then there are four divisors, 1,5, N, 5N
4. In natural numbers 1 ~ 100, the divisors of all composite numbers are the common divisors of odd numbers
Divisors are odd, only if they are the product of even powers of primes
2 ^ x * 3 ^ y * 5 ^ Z * 7 ^ u, where x, y, Z, u are even numbers, and 2 ^ x * 3 ^ y * 5 ^ Z * 7 ^ u

(the third power of X + 1 divided by the square of x) upper limit 3 lower limit 1 definite integral

∫(1→3) (x³ + 1/x²) dx
= x⁴/4 - 1/x：[1→3]
= (3⁴/4 - 1/3) - (1/4 - 1)
= 62/3

How to write the English words of English, sports and art?