17 How do you calculate 9 16 easily?

This should be easy to calculate.

This is 17 16 multiplied by 8+1 in parentheses. That is, to turn nine into 8+1! Then it becomes 17 16 8, plus 17 16 1.

The result is equal to 17 2 + 17 16. It doesn't feel like it's easy, and in the end you have to do the calculations.

To do the math simply, you can add seventeen to sixteen and then multiply it by nine-sixteenths, so that sixteen times nine-sixteenths plus nine-sixteenths equals nine plus nine-sixteenths, which equals nine and nine-sixteenths.

The following points should be noted when performing the sub-calculation.

1. In general, the calculation order of the four operations is: when there are parentheses, calculate first, when there are no parentheses, calculate first, and then calculate, only when the same level of operation, from left to right.

2. Since some calculation problems have their own characteristics, the use of the law of operation can make the calculation process simple and not easy to make mistakes at the same time.

Additive commutative law: a+b=b+a additive associative law: (a+b)+c=a+(b+c).

Multiplicative commutative law: a b=b a multiplicative associative property: (a b) c=a (b c).

Multiplicative distributive property: (a+b) c=a c+b c

3. Note that for the same calculation problem, the result obtained by the simple method is the same as that obtained by the simple method. We can compare the results obtained by the two calculation methods to check whether our calculations are correct.

This is a deformation problem of the multiplicative distributive law, which can be reduced after the transformation. The way to do this is to split 17 into 16+1The multiplicative distributive property is then used for simplification.

9 and 9 16

Since 17 16+1, the original formula is equal to 9 16 (16+1) using the multiplicative distributive property to get 9 16 16 + 9 16 9 and 9 16

Since 17 and 16 are prime numbers with each other, there is no easy way to calculate it, and it is directly calculated as 17x9 16 = 153 16

Here we can think of it as having 17 9 16, 16 9 16 is exactly equal to 9, plus a 9 16 is exactly 17, so the result is 9 + 9 16 = 9 and 9 16

17 and 16 have only a common factor of 1 and cannot be reduced.

9 and 9 13

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4/9 times 5 times 18 with simple calculations:

This problem is simplified by the commutative law of multiplication, the original formula = 4 9*18*5 = 8*5 = 40

7/9 3 + 9/9 of the clan 2 12

1/9 21 + 9/9 1 24

1/9 (21+24).

1 out of 9 45

The upper left side is the numerator, and the right side is the denominator.

Solution: 4 9 ten 4 9x13

4/9x（1+13）

6 and 2 9.

Answer: The original formula is equal to 6 and 2 9.

In the two plus shirts of the original style, both contain the common factor 4 9. After extracting the common factor 4 9, the original formula = 4 9 (1+13). or regiments.