Put the proper prime number in the brackets 8=( ）+( ) 18=( )+( )

Put the proper prime number in the brackets 8=( ）+( ) 18=( )+( )

8 = (3) + (5) 18 = (7) + (11) prime number is also called prime number. It refers to the number that can not be divided by other natural numbers except 1 and the integer itself in a natural number greater than 1

Fill in the brackets with the appropriate prime number () + () + () = 51

(3)+(17 )+( 31)=51

Divide: fill in the brackets with the appropriate prime number;

The sum of two prime numbers is as follows

1. How many numbers do you need to print the page numbers of a 200 page book?
2. How many pages does this book have?
3. How many digits "1" are shared among the 1000 natural numbers of 1-1000?
4. There are 20 pages in a magazine. How many numbers are needed to mark these pages?
5. The publishing house has published a new book with 216 numbers. How many pages does the book have?

A workshop can produce 120 class a parts, or 100 class B parts, or 200 class C parts every day. Three, two, and one parts of class A, B, and C can be made into a set. Now it is required to produce the most complete sets of products within 30 days. How many days should the three parts of class A, B, and C be produced

From now on, the annual deposit at the beginning of each year is 1000 yuan, the annual interest rate is 12%, and the compound interest is calculated once a half year. What is the sum of principal and interest at the end of the fifth year?
It's only 1000 yuan at the beginning of each year

Total: 7189.29
1060.00 2123.60 respectively
2,251.02 3,386.08
3,589.24 4,804.60
5,092.87 6,398.44
6,782.35 7,189.29

See clearly, it's a formula, not a theorem, let alone a straight line after two points

1. Calculation formula of circle arc length: l = n Wu R / 180 sector area formula: s sector = n Wu R ^ 2 / 360 = LR / 2 inner common tangent length = D - (R-R) outer common tangent length = D - (R + R) ① outer separation of two circles D ＞ R + R ② outer separation of two circles d = R + R ③ intersection of two circles R-R ＜ D ＜ R + R (R ＞ R) ④ inner separation of two circles d = R-R (R ＞ R) ⑤ inner separation of two circles d = R + R

Simple calculation: 4 / 9 times 5 / 11 plus 5 / 9 times 7 / 11

4/9×5/11+5/9×7/11
＝1/9×20/11+1/9×35/11
＝1/9×（20/11+35/11）
＝1/9×55/11
＝1/9×5
＝5/9

A work efficiency problem, urgent!
Processing a batch of parts, Party A and Party B cooperate, 6 hours to complete, Party B and Party C cooperate, 8 hours to complete, Party A and Party C cooperate, 12 hours to complete, how many hours and minutes to complete?

The cooperation is 2 (1 / 6 + 1 / 8 + 1 / 12) = 5 and 1 / 3 hours = 320 minutes

(0.1 * 0.3 * 0.9 + 0.2 * 0.6 * 1.8 + 0.3 * 0.9 * 2.9) divided by (0.1 * 0.2 * 0.4 + 0.2 * 0.4 * 0.8 + 0.3 * 0.6 * 1.2)

(0.1×0.3×0.9+0.2×0.6×1.8+0.3×0.9×2.9) / (0.1×0.2×0.4+0.2×0.4×0.8+0.3×0.6×1.2)
=(1×3×9+2×6×18+3×9×29) / (1×2×4+2×4×8+3×6×12)
=27×(1+8+29) / [8×(1+8+27)
=27×38 / (8×36)
=3×19 / (4×4)
=57 / 16

There are several units of housing area, how to convert? Flat, square meters, square meters, are all the same? If there are the same, how to convert

Generally, there are two types: 1. Use area 2. Building area is generally calculated by square meters in China, and there is no other conversion