How to write the little practice writing in Lesson 9 of Chinese Book Volume 2 of grade 4

Chinese grade 4 Volume 2 lesson 27 after class small practice miscellaneous writing
The fish swam to the paper

There were more and more onlookers. They praised and talked about it. Some said it was really beautiful, some said it was really lifelike, and some said it would be nice if it had been painted by him. A mother took her child to Huagang to watch fish. The child pointed to the young man's painting and said, "Mom, I'll learn to draw too!" Mom

How to write the exercises in lesson 27 on page 130 of Chinese volume 2 of grade 4 of primary school

There were more and more onlookers, and they praised and talked about it. Some said it was really beautiful, some said it was really lifelike, and others said it would be nice if it was painted by him. A mother took her child to Huagang to watch fish. The child pointed to the young man's painting and said, "Mom, I'll learn to draw too!" the mother said with a smile, "as long as you are willing to, A primary school student said, "his painting is really beautiful!" another primary school student said, "it's really beautiful!" an old man said, "he can draw the dynamics of goldfish, just like goldfish swimming on paper. It's amazing!" a middle school student said, "yes, I'll take him as my teacher as soon as the college entrance examination is over!" there are many discussions, but only this young man is concentrating on painting, As if nothing had been heard

Please answer the quadratic equation of one variable in junior three, thank you! (28 10:19:9)
（1）『（x+y)2-4(x+y)=5              (2)『2x-3y=1           (3)『3x2-y2=8             (4)『x2+y2=4
            ( x-y)2-2(x-y)=3』            2x2-3xy+y2-4x+3y-3=0』     x2+xy+y2=4』       xy-y2+4=0』
(5)『4x2+12xy+9y2=1              (6)『x2+2xy+y2-4=0
    4x2-9y2=0』                                   x2-2xy+y2-1=0』

1.
(x+y)²-4(x+y)-5=0
Factorization (regarding x + y as a whole)
(x+y+1)(x+y-4)=0
When x + y = - 1, X & sup2; + 2XY + Y & sup2; = 1, X & sup2; + Y & sup2; = 4
Subtract to get 2XY = - 3
Xy = - 3 / 2, the remaining steps are omitted
When x + y = 4, xy = 6
The rest of you follow the same method, I really can't understand, I don't know which two are together

On probability (8 19:47:10)
For a password in a password box, the number in each digit is a natural number from 0 to 9
1 / 999, then the number of passwords should be at least ᦉ 160; ᦉ 160; ᦉ 160; ᦉ 160; ᦉ 160; ᦉ 160; ᦉ 160; ᦉ 160; ᦉ 160; bits

Three
When the number is 3, the probability of dialing the right password is 1 / 1000, less than 1 / 999
The probability of dialing the right password at 4 digits is 1 / 10000
So at least three

Fast (28 20:19:3)
If a, B and C satisfy a2-4a + b2-6b + 13 = 0 and C > b > A, then Sina ● cosa

From a2-4a + b2-6b + 13 = 0, a2-4a + b2-6b + 13 = (a2-4a + 4) + (b2-6a + 9) = (A-2) 2 + (B-3) 2 = 0, because the square is greater than or equal to 0, so A-2 = 0, B-3 = 0, that is, a = 2, B = 3RT △ ABC, and C > b > A, then C is hypotenuse, C = radical under (A2 + B2) = radical 13sina = B / C = 3 / radical 13, cosa = A / C = 2 / root

How to simplify with score and with score
fast

Is the primary school with a score into a false score?
If you want to convert a false fraction into a fraction, you should first divide it into two parts, so that the denominator is the same. For example, 1 and a quarter can be regarded as 1 + a quarter, and 1 can be regarded as four quarters, that is, four quarters plus a quarter. The denominator is the same, and the addition and subtraction of the molecular phase can be regarded as five quarters, which is how to convert it into a false fraction
I don't know if that's what you're talking about

There is a two yuan note. If you want to change it into a corner ticket (fifty cents, two cents, one jiao), how many ways are there?
Don't just write one answer

There are 11 species in total, including 0 to 10 in 5-jiao, 0 to 10 in 2-jiao and 1-jiao;
There are 8 kinds of them, one is 5 jiao, and two jiao can be 0 to 7 Jiao;
There are 2 pieces of 5 jiao, 2 jiao can be 0 to 5 pieces, a total of 6 kinds;
There are 3 pieces of 5 jiao, 2 jiao can be 0 to 2 pieces, a total of 3 kinds;
4 pieces of 5 jiao, 0 pieces of 2 jiao, 1 kind in total
Total: 11 + 8 + 6 + 3 + 1 = 29 species

The quotient of the following questions can be expressed as a fraction. 18 / 19 19 / 18 25 / 26 101 / 25

18 / 19 1 and 1 / 18 25 / 26 4 and 1 / 25

There are 100 banknotes of 50 cents and 2 yuan, totaling 80 yuan. How many banknotes of 50 cents and 2 yuan?

（2*100-80）/（2-0.5）
=120/1.5
=80
100-80=20
Answer: fifty cents 80, two yuan 20

How to write the little practice writing in Lesson 9 of Chinese Book Volume 2 of grade 4