The fruit store shipped 100 kg of apples, 4 kg less than 2 times of pears. How many kg are pears

The fruit store shipped 100 kg of apples, 4 kg less than 2 times of pears. How many kg are pears

（100+4）÷2=52

1+1+2+2+3+3+4+4+…… +How much is 100

11000

As shown in the circuit diagram, calculate the current I1, I2, I3, I4, i5,
 
&Step by step, or suggest a method

If the branch current method is used in this problem, it is difficult to solve the equations
Use mesh current method
I2=I0-I1
I4=I0-I3
I5=I3-I1
As long as the three equations (I0, I1, I3) are solved in the three mesh rows
R1I1+R5(I1-I3)+R2(I1-I0)=0
R3I3+R4(I3-I0)+R5(I3-I1)=0
R2(I0-I1)+R4(I0-I3)=U
Simplification
(R1+R5+R2)I1-R5I3-R2I0=0
(R3+R4+R5)I3-R4I0-R5I1=0
(R2+R4)I0-R2I1-R4I3=U
Simplification
6I1-I3-2I0=0
8I3-5I0-I1=0
7I0-2I1-5I3=0.1
From the first formula, I 3 = 6I 1-2i 0 can be obtained
8(6I1-2I0)-5I0-I1=0
7I0-2I1-5(6I1-2I0)=0.1
Simplification
47I1-21I0=0
17I0-32I1=0.1
From the first formula, I1 = 0.4468i0 is obtained
17I0-32×0.4468I0=0.1
2.702I0=0.1
I0=0.037A=37mA
I1=0.4468I0=16.5mA
I3=6I1-2I0=25.2mA
I2=I0-I1=20.5mA
I4=I0-I3=11.8mA
I5=I3-I1=8.7mA

In the fourth grade, 115 people go for an autumn outing. The bus is limited to 44 people per car, and the rent is 50 yuan per car. The minibus is limited to 9 people per car, and the rent is 12 yuan per car. Can you design a reasonable and cost-effective car rental scheme? (write your plan)

Therefore, it is more economical to rent more buses on the premise of full load and no vacant seats. 115 = 44 × 2 + 9 × 3, you can rent 2 buses and 3 minivans. In this way, you can save the most money. You need to rent 50 × 2 + 12 × 3 = 136 (yuan)

100 and one-third 2x99 and one-third equals_____

100 and two thirds, 99 and one third
=（100+2/3）×（100-2/3）
=100×100-2/3×2/3
=10000-4/9
=9999 and 5 / 9

The concrete definition of "ladder matrix" in linear algebra
I hope it's simple and straightforward!

Let me give you a simple example, for example, ha 1 2 34 5 67 8 9, remember that the first line will never move, and then make the first number of each line zero, that is - 4 times of the first line + to the second line, then - 4 + 4 is 0, and - 7 times of the first line + to the third line, the matrix becomes 1 2 30 - 3 - 60 - 6 - 12, and then the second line

What thoughts and feelings do you Huqiu express
I want it now

Once in the middle of autumn, he felt "no more evil" for the beautiful moon, few visitors, and the tiger hill decorated with red and pink Sheng songs; once in the middle of spring, he felt "only knowing" for the dark Tiger Hill, where he heard the wind and the Buddha's lamp looming. Once in the middle of spring, "when the moon rises in the middle of the night, no one sits down on the stone platform, no more drinking

Lim sin2x / sin5x (x → 0)

Because when x → 0, sin2x → 2x, sin5x → 5x
So the original formula = 2x / 5x = 2 / 5

(2a + 3b-1) (2a-3b + 1) a complete square formula like this?

This is a square difference, not a complete square. (2a + 3b-1) (2a-3b + 1) = (2a) ^ 2 - (3b-1) ^ 2. Another example is: (5x-3y + Z) (5x-3y-z) = (5x-3y) ^ 2-z ^ 2 (2m + 3N + 8t-6s) (2m + 3n-8t + 6S) = (2m + 3n) ^ 2 - (8t-6s) ^ 2. The complete square formula is: A ^ 2 ± 2Ab + B ^ 2 = (a ± b) ^ 2

What does the boy like?

What does that boy like?