People's education press seventh grade volume II English 26 letter word list (unit 1-12 is not required) Part of speech, meaning, thank you

another boring catch daughter everything fountain grandparent
hardly inside just kick launch machine natural
own packet quiz recent sentence town
unusual verb without x-ray yourself zero

When Xiao Jie reads a story book, the ratio of the number of pages he has read to the number of pages left is 2:3. The number of pages Xiao Jie reads is 28 pages less than the total number of 34 pages in this book. How many pages does this story book have?

2 + 3 = 5, 28 (34-25), = 28 (720), = 80 (pages); a: this story book has 80 pages

It is known that the solution set of inequality X & # 178; - ax + 1 > 0 about X is R. try to explain that the image of quadratic function y = x & # 178; - ax + 1 has no intersection with X axis .
It is known that the solution set of inequality X & # 178; - ax + 1 > 0 about X is R. try to explain that the image of quadratic function y = x & # 178; - ax + 1 has no intersection with X axis, and find the value range of real number a

On the inequality X & # 178; - ax + 1 > 0 of X, the solution set is r
That is, the function y = x & # 178; - ax + 1 has positive values,
∵ the image opening of quadratic function is upward,
The image has no intersection with the x-axis
The discriminant = A & # 178; - 4

What's the walking speed per hour

Do you know the walking speed per hour? Maybe you will estimate it to be 20-30 km / h, wrong! Some people have calculated that people's walking speed is generally 4-7 km / h. if they walk fast, they can walk 10 km / h, and some people who walk fast can reach 15 km / h

How to calculate the weight of iron plate?

Length × width × height × 7.85 = weight of iron plate

For two objects moving in a straight line at a constant speed, the distance ratio of a to B is 2:3, the time ratio is 3:1. What is the speed ratio of a to B

A speed 2 / 3, B speed 3 / 1
Speed ratio 2 / 3 to 3 / 1 = 2 / 9

Two equations, three unknowns
Three catties for cat, nine catties for rabbit, four Liang for mouse, no need to weigh, 99 one hundred catties. How many do you have?

Let x cats, y rabbits and Z mice be positive integers
x+y+z=99
3x+9y+0.4z=100
By simplifying the elimination, we get 13X + 43y = 302
x=(302-43y)/13=23+6y+(3-43y)/13
Because x, y, Z are all positive integers
So y = 1,2,3,4
Only y = 4 and x = 10 meet the condition
So z = 85

How do spaceships fly in space
How does a spaceship fly from earth to space? (what's the use of spitting fire?) what's the power?
In space, how can you fly without oxygen?
What's the fuel in the spaceship?

Work is done by the reaction force of air flow, and then go into space according to the precise orbit
There are liquid hydrogen, liquid oxygen and liquid methane in the fuel of the spacecraft. The fuel has different choices according to different distances
There is no oxygen in space. But there is oxidant in the fuel bunker of the spacecraft. The fuel is burned in the bunker and then ejected from the spacecraft

1 / 3 of a number is 1.5 more than half of 58. What is the number?

This number is X
1/3x=58x1/2+1.5
1/3x=30.5
x=91.5

What are the main components of wheel brake

a) Disc brake b) drum brake
1、 Disc wheel brake
1. Basic structure and working principle of disc wheel brake
1) Basic structure
The basic structure of the caliper disc brake is the brake disc, which is fixed with the wheel and rotates together, with its end face as the friction working surface. Its fixed elements are: brake pad, guide pin, wheel cylinder and piston, which are installed on the caliper bodies on both sides of the brake disc, and are generally called the brake caliper. The brake caliper is fixed with the flange on the steering knuckle or axle housing by bolts, And use the adjusting gasket to adjust the relative position between the clamp and the disc

People's education press seventh grade volume II English 26 letter word list (unit 1-12 is not required) Part of speech, meaning, thank you