Composition "another world" 500 words. Quick! The teacher is very. Right! Do me a favor! Please! The teacher is very. Right! Do me a favor! Please! The teacher is very. Right! Do me a favor! Please! The teacher is very. Right! Do me a favor! Please! The teacher is very. Right! Do me a favor! Please! The teacher is very. Right! Do me a favor! Please!

Where the car passed, we never left our footprints, only a little yellow sand flying in the air, rippling in the lazy sunshine, and writing an affectionate Poem under the blue sky. Here, the boundless farmland extends to the unknown horizon, and the calm water reflects the surrounding rocks and trees, everything shows it

1+2+3+4+… +999+1000+999+… +How about 4 + 3 + 2 + 1?

1+2+3+4+… +999+1000+999+… +4+3+2+1=1+2+3+4+… +999+1000+1000+999+… +4+3+2+1-1000=2*[（1+1000）+（2+999）+（3+998）+...+（500+501）]-1000=2*1001*500-1000=1000*1000=1000000

If you take 25 kg from each box, the remaining apples are 5 kg more than the original 3 boxes. How many kg does each box weigh?

A * b = 3A + 4B 7 * x = 45

7*x=45
21+4x=45
4x=24
x=6

Let Z1 and Z2 correspond to the points on the complex plane, and Z1 and Z2 satisfy z1-2z1z2 + 4z2 = 0, O as the origin, and judge the shape of triangle z1oz2

Z1 & sup2; - 2z1z2 + 4z2 & sup2; = 0, (z1-z2) & sup2; + 3z2 & sup2; = 0, assuming Z2 = a + bi, then:
3Z2²=3（a²-b²+2abi）=3a²-3b²+6abi,
（Z1-Z2)²=3b²-3a²-6abi=√3（b-ai)²,Z1-Z2=√3（b-ai),
Z1=Z2+√3（b-ai)=a+√3b+（b-√3a）i
|OZ1|=√（3a²+3b²）,|OZ2|=√（a²+b²）,|Z1Z2|=|Z1-Z2|=2√（a²+b²）
That is: | OZ1 | & sup2; + | oz2 | & sup2; = | z1z2 | & sup2;, so △ is a right triangle

The fruit shop brought 35 apples and 38 pears. The apples weigh 100 kg more than pears
Given that each apple frame is 30 kg, how many kilos does each pear frame weigh? (solution of the equation)

The weight of each pear frame is XKG
35*30-38x=100
x=25kg
Can it solve your problem?

What is 1 + 2 + 3 + 4 until 100?

5050

What are 4 x I1 + 2 x I3 = 30 5 x I2 + 2 x I3 = 40 I1 + I2 - I3 = 0 I1 I2 I3?

For convenience, I use I, J, K to represent I1, I2, i34i + 2K = 30 ①5j+2k=40…… ②i+j-k=0…… ③ From these two formulas, I = 65 / 19, j = 90 / 19, and ③, k = 155 / 19, that is, I1 = 65 / 19, I2 = 90 / 19, I3 = 155 / 19

There are 155 people in the fifth grade of Chaoyang primary school going for an autumn outing. The bus is 600 yuan, and the minibus is 450 yuan. The number of passengers on the bus is 40, and the minibus is 25
Cost effective car rental

Three CMBS and two buses

2.5 * 4 = 10 is 2.5 a factor of 10

No. factors are positive integers