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The 876-298 simple operation method is as follows:
Since 289 is close to 300, it is easier to calculate 289 as (300-2). Easy to calculate.
The laws of arithmetic and the basic properties of numbers are used to make the calculation easy and make it easy to calculate the number of a very complex formula.
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A simple calculation of 778-199 is shown below.
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778-199 is a simple calculation, you can turn 199 into 200-1, and then the calculation is very simple.
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Through observation, it can be found that the number 199 is closest to the integer 200, 199=200-1, then the original becomes 778-(200-1), after removing the parentheses, it becomes 778-200+1, which is equal to 578+1, which is equal to 579
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It's a simple calculation. 99×99+199=99x99+100+99x1=99x(99+1)+100=99x100+100x1=100x(99+1)999×778+333×66=999x778+999x222=999x222=999x(778+222)=999x1000=999000
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The front can be left alone, but 199 can be seen as 200 minus 1. So the feast becomes 778-200 plus 1. It is equal to 578 + 1 = 579. Which type is so it is a simple rounding method. Slow down.
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This is a mathematical problem of addition and subtraction, the form of calculation, so according to the requirements and characteristics of the problem, the simple calculation method should be 778-(200-1) is equal to 778-200+1 is equal to 577, so the calculation of mathematical hydrology must be proficient and only master the calculation method will be better. Others.
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Use the rounding method: close the sum subtraction and the subtraction to see that the one that is close to the whole hundred is obviously a minus.
778-200+1 (originally 199 more minus the state of congratulations 1 plus the Zen family).
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Calculated in an easy way, it can be calculated like this.
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The process is as follows.
Original 778-200+1
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This is a simple way to calculate.
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We can simplify this expression by using the difference product formula $(a-b)(a+b)=a 2-b 2$:
789*(968-969) -788*(969-968) (splits the original expression into two smaller expressions).
789*(969-968) -788*(969-968) (use the difference product formula for each small expression).
Therefore, 789*968-788*969 = 1577.
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Transform 789968-788969 into (789-788)*(968+969).
The distributive property is multiplied, i.e., a*(b+c)=ab+ac.
Counting hail starts to rent next to (789-788) (968 + 969), 1 (1937), that is, 1937.
The answer was 1937.
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Counting Pi Lu Calculation: Zen Grip Book He Hong.
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876-300+2
First subtract 300 because 298 is only two numbers short, which is equal to 300, and then add two because it subtracts two more numbers, and finally the answer is derived.
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You can first tease the mountain rotten key 598 to 600-2, because the formula can be written as: 876-(600-2)=876-600+2=276+2=278
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876-199 Simple Calculations.
The simple operation of pro 876-199 is as follows: 876-199 = 876 - (200-1) = 876-200 + 1 = 676 + 1 = 677
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This is the calculation of mathematical addition, so the simple calculation method should be 837 + 298 = 837 + 300 - 2 = 1137 - 2 = 1135.
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Look at 796 as 800-4, 298 as 300-2, and then add or subtract from the base lift.
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It can be made up of a whole hundred and then calculated, 796 + 298
128 23 23 27 27 How do you calculate simple arithmetic? First of all, the two multiplication formulas with the common factor 23 can be written first, 23 multiplied by the parentheses 128-27 brackets minus 27, you can calculate the multiplier 23 100, add 23, subtract 27, that is, equal to 2300-4, equal to 2296
4 9 3 10 5 9 Easy arithmetic?
Of course, this is to adjust the 5 9 in the back to the front, and add it to 4 9 first, so that you get 4 9 + 5 9 + 3 10, and then you get 9 9 + 3 10, which is 1 + 3 10, which is equal to one and 3 10 >>>More
<> directly convert 24 into fractions for approximation, and finally multiply 32 by 16 to perform simple calculations.
It is directly 4 9 times (1-5 6) + 1 2 = 4 9 times 1 6 + 1 2 = 2 27 + 1 2 = 4 54 + 27 54 = 31 54.
Easy to calculate. Idea: If we want to do a simple calculation, we can use the distributive or associative property of multiplication. >>>More