If the equation AX + by + C = 0 and the equation 2aX + 2by + C + 1 = 0 represent two parallel lines, what is the relationship between a, B and C

If the equation AX + by + C = 0 and the equation 2aX + 2by + C + 1 = 0 represent two parallel lines, what is the relationship between a, B and C

Represents two parallel lines
Then 2A / a = 2B / b ≠ (c + 1) / C
(c+1)/c≠2
c≠1
For a and B, as long as they are not both 0

If the circle (x-a) ^ 2 + (y-b) ^ 2 = 1 always bisects the circumference of the circle x ^ 2 + y ^ 2 + 2x + 2y-3 = 0, then the trajectory equation of the moving point m (a, b) is

Circle (x-a) 2 + (y-b) 2 = 6 always bisects the circumference of x2 + Y2 + 2x + 2y-3 = 0, which means that the intersection line between circle (x-a) 2 + (y-b) 2 = 6 and another circle must be the diameter of the other circle

If the circle (x-a) 2 + (y-b) 2 = 6 always bisects the circumference of x2 + Y2 + 2x + 2y-3 = 0, then the trajectory equation of the moving point m (a, b) is

Circle (x-a) 2 + (y-b) 2 = 6 always bisects the perimeter of x2 + Y2 + 2x + 2y-3 = 0
It shows that the intersection line of circle (x-a) 2 + (y-b) 2 = 6 and another circle must be
The diameter of another circle. Connect the two intersections, and then connect the two centers
And then connect the m point and the two intersections,
The square of the distance between the centers of two circles is equal to the difference of the square of the radius of two circles
(that is, to form a right triangle) so
[a-(-1)]^2+[b-(-1)]^2=1
The equation is
(a+1)^2+(b+1)^2=1

A workshop can make 500 class a parts or 250 class B parts every day, and each class A and class B parts will form a set of products. Now, if we want to make the most complete set of products within 30 days, how many days should each class A and class B parts be made?

If class a parts should be made in X days, then class B parts should be made in (30-x) days. According to the meaning of the question, 500X = 250 (30-x), the solution is x = 10 (days), 30-x = 30-10 = 20 (days). Answer: class a parts should be made in 10 days, and class B parts should be made in 20 days

How long does a 10 watt bulb last
Ordinary small light bulb

1 degree = 1000 W / h, 1000 / 10 = 100 h

150 * 1.2 / 2.5 / 0.6 simple calculation (fast calculation)

150*1.2/2.5/0.6
=150×1.2÷2.5÷0.6
=150×6/5×2/5×5/3
=（150×2/5）×（6/5×5/3）
=60×2
=120

How to calculate the capacity of a lithium battery?
My battery is 1880mah, 3.7V, use time is generally 30 hours, how to calculate the battery capacity? Please explain

1880mah is the nominal capacity of lithium battery. If you want to verify, you need to measure the average current in use. If the working current is about 63ma and takes 30 hours, it is 30 * 63 = 1890mah,
Or 126ma
About 15 hours, that is 126 * 15 = 1890mah, the battery has no virtual standard

7 / 13 △ 8 + 1 / 8 × 6 / 13

7 / 13 △ 8 + 1 / 8 × 6 / 13
=7/13*1/8+1/8*6/13
=1/8*(7/13+6/13)
=1/8*1
=1/8

Is internal energy produced by friction or ampere force? Is there a rule for positive or negative work? Besides these two forces, are there any other forces that can produce internal energy?

It can't be said that it came into being
You can only say & nbsp; change
Friction or ampere force can change the internal energy of an object
 
Friction to slide relative
 

0.24 / ((9.8-20 / 3 * 75%) / 5) = simple operation

0.24/[（9.8-20/3*75%）/5]
= 0.24*5/[9.8-(20/3)*(3/4)]
=1.2/(9.8-5)
=1.2/4.8
=1/4