The equation of a line passing through point P (2,3) and perpendicular to the line 2x + Y-1 = 0 is______ ．

The equation of a line passing through point P (2,3) and perpendicular to the line 2x + Y-1 = 0 is______ ．

∵ the slope of the line perpendicular to the line L: 2x + Y-1 = 0 is k = 12, and the equation of the line perpendicular to the line L: 2x + Y-1 = 0 through P (2,3) is Y-3 = 12 (X-2)

Find the general equation of the line which passes through the point P (1,2) and is perpendicular to the line 2x + y-6 = 0?

x-2y+3=0

On a map with a scale of 1:6000000, the distance between a and B is 2cm. What is the actual distance between a and B? How many hours does it take for a car with a speed of 60km / h to go from a to B?

On a map with a scale of 1:6000000, the distance between a and B is 2cm. What is the actual distance between a and B? How many hours does it take for a car with a speed of 60km / h to go from a to B?
6000000*2=12000000cm=120000m=120km
The actual distance between a and B is 120km
120 △ 60 = 2 hours
It takes two hours to get from place a to place B

(1-2) (2-3) (3-4) (4-5) ·· (2003-2004)

Original formula = (- 1) (- 1) (- 1). = (- 1) ^ 2003 = - 1

Train a and train B run from two places 700 kilometers apart at the same time. Train a runs 85 kilometers per hour and train B runs 90 kilometers per hour. How many hours do the two trains meet?

700 △ 85 + 90 = 700 △ 175, = 4 hours. A: the two trains meet in 4 hours

Solving equation (35-x) (26-2x) = 850

910-70x-26x+2x^2=850
2x^2-96x+60=0
x^2-48x+30=0
Using the following formula
The answer is x = 34 (+ -) root 546

Two cars a and B set out from two places 360 kilometers apart, and after 4 hours, they met on the way. It is known that the speed ratio of car a to car B is 5:4
In contrast, after 4 hours, the two cars meet on the way. It is known that the speed ratio of car a to car B is 5:4. How many kilometers does car a travel per hour

360 * (5 / 9) = 200 200 / 4 = 50 km / h

After the decimal point of a decimal is moved one place to the right, it is 25.2 larger than the original number. What is the original number?

The decimal point of a decimal is moved to the right by one place, which is 10 times of the original and 9 times larger than the original
Original = 25.2/9 = 2.8

A passenger car and a freight car leave from a and B at the same time. The speed of the freight car is 45 times that of the passenger car. After 14 kilometers of the whole journey, the freight car runs 28 kilometers to meet the passenger car. How many kilometers are there between a and B?

A: the distance between a and B is 144 km

In △ ABC, the opposite sides of the inner angles a, B and C are a, B and C respectively

It is proved that the equation of right side = a (bcosc ccosb) = a (B × A2 + B2 − c22ab-c × A2 + C2 − b22ac) = 12 (A2 + b2-c2-a2-c2 + B2) = b2-c2 = left side holds