Example: 3+5-2 = 8-2 = 6;
3-2+5= 1+5=6
Mathematics in the first grade of primary school. Is to add first and then subtract. Or subtract first and then add? Generally calculated from left to right. There is no order requirement for addition and subtraction. You can add first and then subtract, or you can add first and then subtract.
Math question: multiply first, divide then add and subtract, or multiply first, divide then add and subtract?
Good-hearted people help, whether it's adding first and then subtracting, or adding first and then subtracting first and then adding, in your order.
In the formula of mathematics drawing in the first grade of primary school, whether to reduce the front or the back first, usually the front should be reduced first. If it is easier to subtract the latter calculation first, you can subtract the latter one first.
Is there subtraction or addition in the first grade math formula? Add or subtract first? Just count them in order. If there are brackets, count them first.
Add and subtract first and then multiply and divide, or multiply and divide first and then multiply and divide and then add and subtract.
In mathematics, add and subtract first and then multiply and divide, or multiply and divide first and then add and subtract? This is a mathematical problem of hierarchical operation. In addition, addition, subtraction, multiplication and division, addition and subtraction are at one level, and whoever comes first counts first. Multiplication and division are also at the same level, and the order should also be respected. Addition and subtraction is a low-level operation, and its operation level is lower than multiplication and division. Generally, multiplication and division should be counted first, without brackets. If there are parentheses, calculate first, because the operation level of parentheses is the highest in mathematics.
Is it multiplication, division and then addition or multiplication, division and then addition? What are the four operations?
Among them, addition and subtraction are called first-order operations; Multiplication and division are called secondary operations.
operation sequence
When calculating at the same level, calculate from left to right in turn;
Two-stage operation, first multiply and then divide, then add and subtract.
When there are brackets, count the inside of brackets first, and then count the outside of brackets;
When there are multiple brackets, count the brackets first, then the brackets inside and finally the brackets outside.
If there is a power, calculate the power first.
When performing mixed operations, the numbers in parentheses are calculated first, and the parentheses are from small to large. If there is a power, calculate the power first, and then from high to low.