The formula of "more than less" in grade five

The formula of "more than less" in grade five

Two methods
One is subtraction: if A-B > 0, then a > b, if A-B = 0, then a = B, if a-bb, if a / b = 1, then a = B, if a / b = 1

How to do the score problem (try to write all the formulas)
1. Chicken 180 is only 4 / 5 of duck. How many are chicken and duck?
2. There are 120 chickens and how many ducks? If there are 120 ducks, how many chickens?
3. There are 20 boys, 5 less than girls, how many times less than girls? How many times more than boys?
4. 100 tons of goods, 1 / 4 for the first time, 3 / 4 for the second time, how many tons are left?
5. Boys account for 9 / 4 and women for 5 / 9. How many students are there in the class?
6. B look at 60 pages, the remaining 3 / 8, how many pages in the book?
7. Pass rate is 90%, 4 fail, how many people in the class?
8. The first time I read 1 / 2, the second time I read 1 / 5, how many pages are left? How many pages are there in the book?
9. A is 1 / 7 less than B, B is 84, how much is a and B?
10. A is 1 / 7 less than B, number a is 84, find number B? (solution of equation)

3 mathematical problems solving formula! Urgent!
-Square of (- 3) times cube of (- 2) =?
The square of (- 2 / 5) multiplied by 5 / 2 =?
-The fourth power of [- (- 3)] divided by the fourth power of (- 3) =?

[reference answer]
1、 -(-3)²×(-2)³
=-9×(-8)
=72
2、(-2/5)²×(5/2)
=(4/25)×(5/2)
=2/5
3、-[-(-3)]^4÷(-3)^4
=-3^4÷3^4
=-1

How many hours is 18 minutes?

When 18 / 60 = 0.3

99 and 8 / 9 times minus 13

99 and 8 / 9 times minus 13
=(100-1/9)x(-13)
=-1300+13/9
=-1298 and 5 / 9

Given a > 0, f (x) = - 2asin (2x + π 6) + 2A + B, when x ∈ [0, π 2], f (x) ≤ 1
(1) Find the value of constant a and B;
(2) Let g (x) = f (x + π / 2) and LGG (x) > 0, find the monotone interval of G (x)
The answer at the beginning of the second question is f (x) = f (x + π 2) = - 4sin (2x + π / 6) - 1F (x + π / 2). How can you even wait for the following formula? The answer on the Internet is the same, that is, at the beginning of the second question, he didn't even wait for me to understand it

Sin must belong to [- 1 / 2,1], a is greater than zero, then f (x) min = - 2A + 2A + B = - 5, f (x) max = a + 2A + B = 1

Draw a round lawn on a plan with a scale of 1:2000 and a radius of 3cm. The actual area of the round lawn is () square meters?
11304 square meters, right

Radius = 3 × 2000 = 6000 cm = 60 m
Area = 60 × 60 × 3.14 = 11304 square meters

How much is 85% minus 10%?

85%-10%=75%

Derivative of piecewise function
F (x) = 2 / 3 * x ^ 2 x less than or equal to 1
x^2 x>1
What are the left and right derivatives at x = 1

F (x) = 2 / 3 * x ^ 2, X is less than or equal to 1;
x^2,x>1 .
What are the left and right derivatives at x = 1?
Left:
f'(x) = 4/3x = 4/3
right:
f'(x) = 2x = 2

9999×2222+3334×3333=

33330000