1, number of copies × number of copies = total number of copies, number of copies = number of copies = number of copies = number of copies = number of copies = number of copies = number of copies.
2, 1 multiple× multiple = multiple, multiple1multiple = multiple/multiple = 1 multiple.
3. Speed × time = distance, distance/speed = time, distance/time = speed.
4. Unit price × quantity = total price, total price/unit price = quantity, total price/quantity = unit price.
5. Work efficiency × working hours = total workload, total workload ÷ work efficiency = working hours ÷ total working hours = work efficiency.
6. Appendix+Appendix = sum, and-one addend = another addend.
7. The minuend-subtrahend = difference, the minuend-difference = subtrahend, and the difference+subtrahend = minuend.
8, factor × factor = product, product ÷ one factor = another factor.
9. Divider = quotient, dividend = divisor, quotient × divisor = dividend.
Reflections on solving practical problems in mathematical evaluation;
(1) substitution method has some application problems. Give the relationship between two or more unknowns and find these unknowns. When thinking, we can replace another unknown with one unknown according to the conditions given in the question, thus simplifying the relationship between data volumes. So as to find a solution to the problem.
(2) Hypothetical method Some application problems need two or more unknowns. When thinking, you need to put forward some assumptions first, and then calculate according to the known quantity in the stem. According to the contradiction of data volume, make appropriate adjustments and finally find the correct answer.