When a car goes from city a to city B, it takes two fifths of the whole journey in three hours. According to this calculation, how many parts of the whole journey are left after another four hours?

2/5÷3*4=8/15
1-2/5-8/15
=1/15

Calculation: (1-2) * (2-3) * (3-4) * ~ * (100-101)

It's to the 100th power of - 1, and the answer is 1

Choose one group from the following group, imagine boldly and write a passage. A: stars, trees, houses B: universe, earth, moon

I went out of the house and stood by the little tree to see the stars in the sky
The earth and the moon are little dust in the universe

The difference between one-half of a number and two is four times greater than its reciprocal

Let a number be x, and the expression is: X / 2-2-1 / x = 4

Does friction force have anything to do with elasticity?

1. Friction (1) definition: when two objects in contact with each other are about to move or have moved relative to each other, they will produce a kind of force on the contact surface to hinder the relative movement, which is called friction. (2) the friction between objects must have the following three conditions: first, the objects are in contact with each other and squeeze each other

If a and B are opposite numbers and a ≠ 0, then the root of AX + B = 0 is
Do you mean

ax＋b=0
ax=--b=a
x=a/a=1

The distance between the two places is 600 km. The two trains start from the two places at the same time. Three hours later, the two trains meet. It is known that the speed ratio of the express train and the local train is 11:9. What are the speeds of the express train and the local train per hour?

600/(11x+9x)=3
x=10,11x=110,9x=90
The speed of express train and local train is 110 km / h and 90 km / h respectively

1. If 1:1 of a + a = - 2, then 4 times of a + 1:4 of a =? 2. If 1:1 of a + a = 5, then 2:2 of a (4 times of a + 2 times of a) =? 2?
3. How many integers n satisfy (2 times of n-2N + 1) 2 + n times = 1?
4. If the quadratic of X - MXY + 4Y is a complete square formula, what is the value of M?

1. A + 1 / a = - 2, a ^ 2 + 1 / A ^ 2 + 2 = 4, a ^ 2 + 1 / A ^ 2 = 2, a ^ 4 + 1 / A ^ 4 + 2 = 4, a ^ 4 + 1 / A ^ 4 = 22. A + 1 / a = 5, a ^ 2 + 1 / A ^ 2 + 2 = 25, a ^ 2 + 1 / A ^ 2 = 23 (a ^ 4 + A ^ 2 + 1) / A ^ 2

4X ^ 2-8 ^ 2 mathematics, factorization

Original formula = 4x & # 178; - 64 = 4 (X & # 178; - 16) = 4 (x + 4) (x-4)

Pears, apples and bananas are three kinds of fruits from the fruit shop. Pears and apples weigh 30 tons, apples and bananas weigh 26 tons, of which apples account for five percent of the three kinds of fruits
Pears, apples and bananas are three kinds of fruits from the fruit shop. Pears and apples weigh 30 tons, while apples and bananas weigh 26 tons, of which apples account for two fifths of the three kinds of fruits. How many kilograms do these three kinds of fruits weigh?

Total (30 + 26) / (1 + 2 / 5)
=56÷7/5
=40 tons
Banana 40-30 = 10 tons
Pear 40-26 = 14 tons
Apple 40 × 2 / 5 = 16 tons

When a car goes from city a to city B, it takes two fifths of the whole journey in three hours. According to this calculation, how many parts of the whole journey are left after another four hours?