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Xiao Ming raised both ducks and sheep. He asked Xiao Ming how many ducks and sheep there were. Xiao Ming said: ducks and sheep have 13 heads and 36 legs. How many ducks and sheep do you have?
Chicken and rabbit are in the same cage
Suppose 13 ducks are all ducks, with legs: 13 * 2 = 26
Now there are 36 legs, 36-26 = 10 more
This is because each sheep has 4-2 = 2 legs more than each duck
So there are: 10 / 2 = 5 sheep
Ducks: 13-5 = 8
Find the rules:
1 2 2 3 3 4 （ ） （ ） （ ） （ ） （ ）
Analysis of specific points, can write how to calculate
1 2 2 3 3 4 （4 ） （5 ） （5 ） （6 ） （ 6）
The singular is 1, 2, 3, 4
Even numbers are 2, 3, 4, 5
If a divided by half = B divided by three quarters = C divided by five fifths and a B C is not zero, compare a B C and explain why
We can get 2A = (4 / 3) B = C from the question, because two a are equal to one C, so C is greater than a, at the same time, we can know that C is also greater than B. we can get a = 2 / 3B from 2A = (4 / 3) B, then B is greater than a
So C is greater than B and greater than a
(x + - - Square) = x square + 4xy + 4Y square
Find the number of horizontal lines, it is best to write the process
2Y
If x-2y = 2, find the value of x ^ 2-4y ^ 2-8y
x^2-4y^2-8y=(x-2y)*(x+2y)-8y=2x+4y-8y=2x-4y=0
y=3/4x x-8y=-15
A quadratic equation of two variables
y=3/4x①
x-8y=-15②
① Substituting (2)
x-6x=-15
-5x=-15
x=3③
③ Substituting (1)
y=9/4
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