Personal advice:
The calculation of this account is simple. Generally speaking, if you buy 8 barrels of peanut oil, you can get 9 barrels of oil, and the postage for 9 barrels of oil can be 108×8=864 yuan. Because the company wants to buy 63 barrels, it needs 63÷9=7 times. In other words, the company has to buy 8 barrels of peanut oil 7 times to get 63 barrels. In the purchase process, it costs 864×7=6048 yuan. I suggest that you must learn math well in your life, so as to reduce your losses better.
Four operations refer to four operations: addition, subtraction, multiplication and division. Four operations are the important content of primary school mathematics and the basis of learning other related knowledge.
Extended data:
First, the nature of the multiplication operation
1, the product of several numbers is multiplied by a number, so that any factor in the product can be multiplied by this number and then multiplied by other numbers. For example: (25×3 × 9)×4=25×4×3×9=2700.
2. Multiply the difference between two numbers by a number, so that the minuend and the minuend can be multiplied by this number respectively, and then subtract the product. For example: (137-125) × 8 =137× 8-125× 8 = 96.
Second, the comprehensive formula refers to the formula with addition, subtraction, multiplication and division at the same time, but at least one level (with two symbols):
Matters needing attention in comprehensive calculation formula (four operations):
1. If there is only addition and subtraction or only multiplication and division, it is calculated from left to right. For example, 2+ 1- 1=2, first calculate the number of 2+ 1, and then subtract 1 from the number of 2+ 1.
2. If primary operation and secondary operation exist at the same time, the secondary operation is calculated first.
3. If there are primary, secondary and tertiary operations (i.e. power, root and logarithm operations) at the same time, first calculate the tertiary operation, and then calculate the other two levels.
4. If there are brackets, count the numbers in brackets first (no matter what level, count first).
5. The third level should be counted in brackets, and then the second and first levels should be counted.
6. If a number is divided by the sum or difference of two numbers, you can't divide the number by these two numbers and add or subtract them. For example:10 ÷ 5+10 ÷ 2 ≠10 ÷ (5+2).