Mom Circle
When reviewing the problem, first clarify the quantitative relationship between the problem and the effective conditions, and then flexibly use the relational column calculation to solve the problem. Note the culling of invalid conditions.
The relationship between the parts of addition and subtraction:
Addition + Addition and, and - Addition Added;
Minus-minus difference, subtraction-difference subtraction, subtraction + difference subtraction.
The relationship between the parts of multiplication and division:
multiplier x multiplier product, product multiplier multiplier;
Dividend Quotient, Dividend Quotient, Dividend Quotient, Divisor x Quotient = Dividend.
0 cannot be used as a divisor, but can be used as a dividend.
0 divided by any number equals 0, 0 multiplied by any number equals 0, and any number plus 0 or subtracted from 0 to get any number.
Mixed operations without parentheses, multiplication and division first, and addition and subtraction later.
The function of parentheses in an equation is to change the order of calculations.
There is a mixed formula of parentheses, first count the inside of the brackets (when there are middle brackets, first count the inside of the brackets, then count the inside of the brackets), and then count the outside of the brackets.
Note that in True/False Questions 2 and 3, multiplication and division are same-level operations, and the calculations are calculated in no particular order, in the order of the equation.
Question 2 of the second question, the original calculation order of the question formula is to calculate multiplication and division first, and finally to calculate addition, if you want to calculate the addition first, you must borrow parentheses to change the calculation order, that is, 27+54 brackets.
The third key word is "the most cost-effective", that is, rent a cheap car as much as possible and do not have empty seats.
We can use the calculation of which boat has the least number of people, and then use the remainder division or list method to help us understand and analyze.
Large van single **: 96 8 12 (yuan).
Minivan single person**: 90 6 15 (yuan).
There is remainder division, and since 8 people are the cheapest, divide the total number of people by 8 people:
44 8 5 (vehicles).4 (person).
Because there is a remainder, we can calculate which is more cost-effective by thinking about +1 or subtracting 1.
5 large vans + 1 small van 5x96 + 90 = 570 (yuan).
4 large vans + 2 small vans 4x96 + 2x90 = 564 (yuan).
List method: Because 44 is neither a multiple of 6 nor a multiple of 8, it is very likely that both cars will be needed.
As can be seen from the list, there are no seats available in the following two cases.
When the number of van vehicles is 1, the number of van vehicles is 6, and the total amount of money is 96 + 90x6 = 636 (yuan);
When the number of van vehicles is 4, the number of van vehicles is 2; The total amount of money is 96x4 + 90x2 = 564 (yuan).
Therefore, it is the most economical to rent 4 large vans and 2 small vans.