Various organisms under the microscope (1)

Various organisms under the microscope (1)

Question 1: multicellular organisms, dogs and sheep, unicellular organisms, Chlamydomonas, all life activities. Question 2: B question 3 (1): none, need, it is animal (2): cilia, oral groove, food bubble question 4: B question 5 (1): spirochetes, cocci, bacilli (2): nucleus, cell wall, cytoplasm, chloroplast and feeding structure, existing

Is there a simple algorithm for 80.64 △ 2.56-2.56

No simple algorithm

8/9+4.56+1/9+5.44.
5T, be quick~~
①8/9+4.56+1/9+5.44
②5/8×0.25×4/5×4
③4/15×[3/4-(7/16-1/4)]
④11/9-5/8-3/8
⑤（2/3+1/4）÷7/6+2/7
Thank you birds~~~

1:(8/9+1/9) + (4.56+5.44) =1+10=11
2:5/8*1/4 *4/5 *4 =(5/8*4/5) * (1/4*4)=4/8=1/2
3:4/15 * (3/4+1/4 -7/16)=4/15 * 9/16=3/20
4: 11/9-(5/8+3/8)=2/9
5: (2/3+1/4)*6/7+2/7=4/7+3/14+2/7=15/14

The number of real number solutions of the system LXL + y = 12 x + Lyl = 6 is

First of all, the X and Y symbols cannot be the same
If both are positive numbers, then x + y = 12, x + y = 6
Self contradiction does not hold water
If both are negative, then - x + y = 12, X-Y = 6 = - (Y-X) = - 12
Self contradictory, also does not hold water
The opposite of sign
x>0,y

Solve the equations: x + Y / 2 + X-Y / 3 = 64 (x + y) - 5 (X-Y) = 12

Let a = x + y, B = X-Y
The original equations are as follows
A / 2 + B / 3 = 6, namely 3A + 2B = 36, namely 12a + 8b = 144
4a-5b = 12, that is, 12a-15b = 36
Subtraction: 23B = 108, B = 108 / 23, and a = 12-2b / 3 = 204 / 23
Therefore, there are:
x=(a+b)/2=156/23
y=(a-b)/2=48/23

Given that the solution of the system of equations 2x-y = 3,2kx + (K + 1) y = 10 satisfies x + y = 0, find the value of K

x. Y satisfies x + y = 0;
Then you can choose to solve the equations
2x-y=3；
x+y=0；
The solution is x = 1, y = - 1;
Substituting 2kx + (K + 1) y = 10
k=11

X + | 2x + y | = 10 to solve the equations {x-2y = 8
--------------------x+|2x+y|=10
Solving equations{
--------------------x-2y=8

When 2x + Y > 0
It becomes 3x + y = 10, x-2y = 8
The solution is x = 4, y = - 2
Satisfy 2x + Y > 0
When 2x + y < 0
Change to - X-Y = 10, x-2y = 8
y=-6,x=-4
Satisfy 2x + y < 0
Two sets of solutions are x = 4, y = - 2 or
x=-4,y=-6

{x + y + Z = 6, x-z = 2, 2x-y + Z = 5} to solve the equations

x+y+z=6 (1)
x-z=2 (2)
2x-y+z=5 (3)
(1)+(3)
3x+2z=11 (4)
(2)×2+(2)
2x+3x=4+11
5x=15
therefore
x=3
z=x-2=1
y=6-x-z=2

Solve the following equations 2 (X-Y) / 3-x-y / 4 = - 1 ① 6 (x + y) - 4 (2x-y) = 16 ②
For example, we can get what x = from the number, and bring what into what

Let 2 (X-Y) / 3-x-y / 4 = - 1. A
6（x+y）-4（2x-y）=16.b
By simplifying formula a (multiplying the numerator and denominator by 12 at the same time), we get 8 (X-Y) - 12x + 3Y = - 12. C
From B: 6x + 6y-8x + 4Y = 1610y-2x = 165y-x = 8, so x = 5y-8. D
Substituting formula d into C, we get 8 (5y-8-y) - 12 (5y-8) + 3Y = - 12
32y-64-60y+96+3y+12=0
-25y+44=0
So y = 44 / 25
Substituting y = 44 / 25 into D, we get x = 4 / 5
To sum up: x = 4 / 5
y=44/25.

Solving equations 2 (X-Y) / 3-x + Y / 4 = - 16 (X-Y) - 4 (2x-y) = 16

2 (X-Y) / 3-x + Y / 4 = - 1 multiplied by 12
8（x-y）-3(x+y)=-12
8x-8y-3x-3y=-12
5x-11y=-12
6(x-y)-4(2x-y)=16
6x-6y-8x+4y=16
-2x-2y=16
x+y=-8
y=-x-8
5x-11(-x-8)=-12
5x+11x+88=-12
16x=-100
x=-25/4
y=-x-8=25/4-8=-7/4
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