12 5 3 9 16 1 12 5 How to calculate?

I think the minus sign in your middle should be the plus sign, otherwise he doesn't have a very simple algorithm, and its result is a negative number, if it's a plus sign, it's simple, mention the front is the common factor, and the parentheses at the back are, this addition is 20. And then it is. The result is equal to 250.

Solution: Equal to (-305 2), that is, equal to.

It is known how much the demand is equal to.

x y - x z = x y - z) Answer: Equal to -305 2, [i.e. equal to.

In fact, the main method of this question is industrial cohesion. and then subtract, so it is easier to calculate.

How do you calculate it, how do I feel that your data is a bit of a problem?If there is no problem, this should be a middle school calculation problem, because it is a negative number!It's a common factor, and it can be brought to the front, but there are three points 9-16 points in parentheses!

Isn't it supposed to be a plus sign in the middle?If it's a plus, the topic is pretty straightforward. The two add up to a 20 whole number.

But if the two are subtracted, he gets a negative number.

According to the multiplicative distributive law, it can become.

If the problem is addition, it will be easier.

So we can do a detailed calculation through the simple calculation process above and get the answer yes.

There are two equations before and after the problem, you can extract it and calculate the others, as follows:

According to the proposal, we find that there are minus signs on both sides, so we extract the common factor.

Observe, there are common factors.

Simple algorithms.

This question may be wrong, or the subject has copied it wrong, this question should be a question of examining the distributive and associative properties of multiplication, it is an aspect calculation, it should be addition, this question is more meaningful:

If this problem is calculated according to the multiplicative distributive law of elementary school, the result cannot be calculated, because this 12.5 3.9 cannot subtract 12.5 16.1, that is, the subtracted number is smaller than the subtracted number.

Draw out the common factor first, and then round it up as much as possible.

Put it together, and then put it together, and that's a pretty good calculation.

A simple calculation for this question is:

The common factor can be extracted based on the multiplicative distribution rate

Let's put the same factor first.

Easy calculation:

Order of operationsIn sibling operations, it is calculated from left to right;

In two-level operations, multiplication and division are calculated first, and addition and subtraction are calculated later.

When there are parentheses, count the inside of the brackets first, and then the outside of the brackets;

When there are multiple layers of parentheses, count the ones in the small brackets first, then the inside of the middle brackets, then the inside of the braces, and finally the outside of the brackets.

If there is a power, the power is counted first.

In a mixed operation, the number in parentheses is counted first, from the smallest to the largest, and if there is a power, the power is calculated first, and then from the advanced to the lowest.

Personally, I think it's easiest to go with the flow.

The simple calculation process is as follows:

1. Extract the original formula:

2. Calculation process:

Group sale =13+80+(

3. Calculate the calculation result:

4. Thank you, looking forward to your eyes.

The difference is (

This problem is calculated like this, so the result is 3000.

4800x100x1

1800÷(10x10)

Original. 3bf33a87e950352aebcd37875843fbf2b3118b94< img > diagram.