Aunt, I buy a box of biscuits, a bag of milk (10 yuan) children, originally you use 10 yuan to buy a box of biscuits is much But it's not enough to buy another bag of milk! Today is children's day. I'll give you 10% discount on the biscuits I bought. Please take two things. There's also your change of 80 cents. The price of a box of biscuits is in integer yuan. (please use one yuan equation to solve it, thank you.)

Aunt, I buy a box of biscuits, a bag of milk (10 yuan) children, originally you use 10 yuan to buy a box of biscuits is much But it's not enough to buy another bag of milk! Today is children's day. I'll give you 10% discount on the biscuits I bought. Please take two things. There's also your change of 80 cents. The price of a box of biscuits is in integer yuan. (please use one yuan equation to solve it, thank you.)

10 yuan - milk

4m + 3N + m-3n simplification
666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666

4m+3n+m-3n
=5m

1: There are three points a (0, - 3), B (3.3), C (x, - 1) in the plane
2: If P is a moving point on circle x square + y square = 1, then the minimum distance from point P to line 3x-4y-10 = 0 is:
Calculation and evaluation: (LG8 + lg1000) lg5 + 3 (LG2) square + LG6 negative first power + lg0.006

1: There are three points a (0, - 3), B (3.3), C (x, - 1) in the plane
If the vector AB is parallel to BC, because it passes through point B
Therefore, a, B and C are collinear
So: k = [(3 - (- 3)) / (3-0) = [(3 - (- 1)) / (3-x)
So: x = 1
2: If P is a moving point on circle X & sup2; + Y & sup2; = 1, then the minimum distance from point P to line 3x-4y-10 = 0 is:
The center of the circle X & sup2; + Y & sup2; = 1 is the origin o (0,0), and the radius r = 1
The distance from the origin o (0,0) to the straight line 3x-4y-10 = 0 d = 10 / √ (3 & sup2; + 4 & sup2;) = 2
Therefore, the minimum distance from point P to line 3x-4y-10 = 0 is D-R = 1
It's not hard to understand after drawing
3. (LG8 + lg1000) lg5 + 3lg & sup2; 2 + LG6 negative power + lg0.006
=(lg2³+lg10³)lg5+3lg²2 +lg1/6 +lg6/1000
= (3lg2+3)(1-lg2)+3lg²2 -lg6 +lg6- lg10³
=3lg2-3lg²2+3-3lg2+3lg²2 -lg6 +lg6-3
=0

The equation with two unknowns and the degree of the term with unknowns is 1 is called bivariate linear equation

Integral. It is different from the fractional equation of unknown number on denominator

Can an ordinary plane on earth fly on the moon?
Airplanes take off in the same way as on earth

No. There are several important factors for an ordinary plane to take off. First, fuel. The plane burns oxygen on fuel. If there is no oxygen, how can it start? Second, even if the plane carries oxygen, there is still the problem of lift. There is no air on the moon. The lift of an ordinary plane is not provided by the engine, but by the wings. The plane rushes forward, and the air

3x minus 15 equals 4x minus 23

3x-15=4x-23
3x-15+(15-4x）=4x-23+(15-4x)
-x=-8
x=8

What does friction force have to do with

The size of friction is related to two factors: the size of positive pressure and the contact surface of two objects
The above is the junior high school physics textbook
In fact, modern physics precision experiments show that: the size of friction is also related to the relative motion speed of two objects, the greater the speed, the smaller the friction. (but this factor is not in the physics textbook, so the landlord knows it. When doing questions and exams, never write this answer.)

If 10 ^ 2x = 16, then 10 ^ - x equals

10^2x=16
Prescription,
10^x=4
10^-x=1/10^x=1/4

A car and a freight car are moving towards each other. The car is 85 kilometers per hour, and the freight car is 80 kilometers per hour. The distance is 1980 kilometers. They meet in a few hours

12 hours. 1980 / 165 = 12

a. B represents two non-zero natural numbers. Given that a: B = 5:9, and 1 / 2-1 / 2 of a = 1 / 90, which natural numbers are a and B?

a:b=5:9
a=5b/9
1/a-1/b=1/90
9/5b-1/b=1/90
9/5b-5/5b=1/90
4/5b=1/90
5b=360
b=72
a=5×72÷9=40
That is: a = 40, B = 72