What is substance? What is its theoretical significance? An introduction to the basic principles of Marxism

What is substance? What is its theoretical significance? An introduction to the basic principles of Marxism

Matter is the objective reality which does not depend on human consciousness and is reflected by human consciousness
The only property of matter is objective reality. The first property of matter, the second property of consciousness and the determination of consciousness by matter are the basic concepts of materialism

Why to use low-grade car climbing, who can use the principles of physics to explain

Using the formula P = FV,
It can be seen that when the output power P of the engine is fixed, the traction force F is inversely proportional to the speed v. to increase the traction force, the speed must be reduced. Therefore, when the car goes uphill, the driver often uses the method of shifting to reduce the speed, so as to get greater traction force
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What is the relationship between the sum of two elements and the product of two elements of quadratic equation of one variable?

Let two of the quadratic equation y = ax ^ 2 + BX + C be X1 and X2, then: X1 + x2 = - B / (a), x1 × x2 = C / A