First, the relationship
1, multiple x multiple = multiple, multiple 1 multiple = multiple, multiple = 1 multiple; Speed x time = distance, distance-speed = time, distance-time = speed; Add dozens of addends = sum, and-one addend = another addend; Subtraction-subtraction = difference, subtraction-subtraction = subtraction, difference+subtraction = subtraction.
2, factor X factor = product, product/one factor = another factor; Dividend/divisor = quotient, dividend/quotient = divisor, quotient x divisor = dividend; Unit price x quantity = total price; Single output x quantity = total output; Speed x time = distance; Work efficiency x time = total workload.
3. Unit conversion: 1 km =1km =1000m1m =10 decimeter1decimeter =10. 1 m2 = 100 square decimeter 1 square decimeter = 100 square centimeter 1 square centimeter = 100 square millimeter.
4. 1 m3 = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter 1 cubic centimeter = 1000 cubic millimeter; 1 ton = 1000 kg 1 kg = 1000 g = 1 kg =2 kg; 1 ha = 1 0000m21mu = 666.666m2; 1 liter = 1 cubic decimeter = 1000 ml 1 ml = 1 cubic centimeter.
Second, the quantitative relationship.
Quantitative relationship is the relationship between two or more numbers (or expressions). Such as size, multiple, reciprocal, the quantitative relationship is the relationship between quantity and quantity expressed by formula. For example, A is twice as much as B, and the quantitative relationship is a=2b.
Third, mathematics.
1, mathematics [English: Mathematics, from ancient Greece μ? θξμα(máthēma)； Often abbreviated as math or maths], it is a discipline that studies concepts such as quantity, structure, change, space and information. Mathematics is a general means for human beings to strictly describe and deduce abstract structures and patterns of things, and can be applied to any problems in the real world.
2. All mathematical objects are artificially defined in essence. In this sense, mathematics belongs to formal science, not natural science. Different mathematicians and philosophers have a series of views on the exact scope and definition of mathematics. Mathematics plays an irreplaceable role in the development of human history and social life.