Questions about Grade 6 Mathematics 1 question about time and comprehensive application 30

Can elementary school solve binary equations? Set: each mu of grass grows x every day, cattle eat y every day, list the equations 33 + 54 * 33x = 22y and 28 + 84 * 28x = 17y, solve x, y, the result can be calculated.

Let the numerator be x, and the numerator plus 1 can be reduced to a quarter, then the denominator = 4 (x+1) denominator minus 1 can be reduced to one part of the five.

x/[4(x+1)-1]=1/5

x/(4x+3)=1/5

4x+3=5x

x=34(x+1)=4*(3+1)=16

So this score is 3 16 for Nakuan

After cutting off the circle with the largest diameter, the remaining part is considered as a rectangle, which is 20 long and 10 wide, and can be cut into 2 pieces.

This kind of topic is cut, not spelled, and it is not possible to use a large area or a small area to find the number.

20 10 2 (pcs).

The 2 circles with the largest diameter are d=20, and the remaining pieces of paper are 20cm*10cm

After cutting out a circle with the largest diameter of 2 pieces, the original 30cm becomes 10cm, and the original 20cm does not change.

There is also a rectangular piece of cardboard 20 cm long and 10 cm wide

The rest can also be cut out into 2 small circles with a diameter of 10 cm.

2, the maximum circle is 20cm in width, so the remaining rectangular straight plate is 20cm long and 10cm wide (30-20 = 10) You can cut the remaining straight board into two parts of a square with a side length of 10cm, and each square can be cut out of a small circle with a diameter of 10cm

The largest diameter circle (20 cm in diameter), and the remaining 10 cm diameter small circle can be cut out of 3.

1: There were originally 30 awning boats in the East Lake Scenic Area of Shaoxing, with a daily income of 2,550 yuan. According to this calculation, how much can the existing 45 cruise ships earn per day? (Proportional solution).

30：2550 = 45：x

x = 3825

2: A truck and a passenger car drive out of A and B at the same time, and their speed ratio is 2:3.

1) If two vehicles meet at a distance of 24 km from the midpoint. How many kilometers is the highway between A and B?

x/2 - 24) :x/2+24) = 2:3x = 240 km

2) If two cars meet within 2 hours. How many hours does it take for a truck and a bus to travel alone?

2*(2+3) 2 = 5 hours -- trucks 2*(2+3) 3 = 10 3 hours -- buses.

1. Set a daily income of x yuan.

x:45=2550:30

x=3825

II. 1).2+3=5

24 (1 2-2 5) = 240 km.

2) Truck 2 (2 5) = 5 hours.

Passenger car 2 (3 5) = 10 3 hours.

1. Solution: Suppose you can earn x yuan per day.

x：45=2550：30

30x=2550x45

30x=101250

x=101250÷30

x=3375A:

Analysis: When two numbers are and a certain number, the closer they are, the larger the product, and the three numbers are the same. So when the length, width, and height are equal, i.e. this is a cube box, (the cube is a special box) is the largest.

Solution: When the box is a cube, the volume is the largest.

Then the side length a = 150 3 = 50cm

Volume v = 50 = 125000cm

A: The maximum volume is 125000cm

The maximum volume is 50 to the third power, which is 125,000

Place the box inside a sphere, exactly tangent to the inner wall of the find.

We know that if it's a cube, it's the biggest.

150cm, which can be divided into a cube with an edge of 50cm. So, v(max) = 125,000 cubic centimeters.

Of course, this is a lazy algorithm. Hey.

When the length, width and height are 50cm, the maximum volume is 125,000 cubic meters, and each is 50, which should be the largest!

The length, width and height are all 50, and the multiplication of the three is 125000

1. All of them can be done as chasing problems.

Imagine that there is a needle extended in the opposite direction of the hour hand, but in fact the minute hand is chasing the "reverse hour hand".

Every 12 hours, the hour hand makes 1 revolution and the minute hand turns 12 times, and all of them move at a constant speed.

By the next 6 o'clock, 12 hours to catch up 11 times.

So the time required each time is 12-11 hours.

This translates to 65 minutes and seconds.

The next time the condition is met, it is 7:05 minutes.

Solution: Xiaojie watches TV for 4 5 hours a day, and watches TV for 5 days = 4 5 5 = 4 (hours).

Answer: Xiaojie watched TV for a total of 4 hours in 5 days.

If it's a brain teaser, watch four-fifths of an hour of TV for 5 hours.

If it is calculated normally, then 5 hours of total TV watching time = (4 5) * (5 24) = 1 6

Four-fifths of an hour equals 48 minutes, and four-fifths of an hour a day is 48 minutes of TV a day, so 5 hours is still 48 minutes.

60 divided by 5 multiplied by 4 and divided by 60= then 5 hours of TV watching for 4 hours?