32 1=9,
432 1=9,
5432 1=9,
65432 1=9,
765432 1=9,
8765432 1=9,
98765432 1=9。
There are many methods available. The following is a set of reference answers.
3×(2+ 1)=9,
4+3+2× 1=9,
54÷3÷2÷ 1=9,
(6+54)÷3÷2- 1=9,
(76+5)÷(4×3-2- 1)=9,
(87-6-54)÷3×(2- 1)=9,
(98÷7-6)×5÷4-3+2× 1=9。
2. Now there are two natural numbers, and it is known that the sum of the two numbers does not exceed 40. A knows the sum of two numbers and b knows the product of two numbers.
After a while, A said to B, I bet you don't know my number.
After a while, B replied, but I already know your number.
After a while, A replied, I also know your number.
Just like solve riddles on the lanterns. Then can you figure out what the numbers in A and B's hands are?
One day, the circus will hold an animal sports meeting. Coke is not good for small animals.
At the beginning of the competition, the elephant referee announced that the 100-meter preliminaries for puppies and monkeys were the first.
Unexpectedly, when the puppy ran to the finish line, the little monkey ran 90 meters and his mouth pursed with anger!
In the final, the clever monkey suddenly said, "puppies are born to run fast." It's unfair if we stand on the same starting line. I propose to move the starting line back 10 meter. "
The puppy held the monkey's hand in agreement. The little monkey thought happily, so that he could reach the finish line at the same time as the puppy.
Do you think the monkey will get what he wants?
Our factory is adjusting its work recently. Staff A, B, C, D, E, F and G are not sure who is doing what in the seven jobs of opening and closing doors, cleaning doorknobs, washing bottles, sweeping foreman, welfare workers and workers.
Four of them were selected as factory representatives to attend a seminar on development policies for the next decade. The four of them are called Mr. Foley, Mr. Sweeping the Floor, Mr. Bottle and Mr. Door. Although each of them knows his own title, they don't know other people's titles.
According to their speeches at the meeting, the four representatives made the following records:
Mr. Foley: (1)F is a bottle washer.
(2) B is a worker.
(3)D is not Mr. Bottle.
Mr. Sweeper: (1)A is a worker.
(2)C is not Mr. Bottle.
Mr. Bottle: (1)E is the welfare officer. (2)B is a bottle washer.
Mr. Men:
(1)D is a worker.
(2)C is a bottle washer. (3) The work of G has nothing to do with the door.
Interestingly, but not surprisingly, if the person mentioned in each of the above sentences is present, then this sentence is correct, and if the person mentioned in the sentence is one of the three people who are not present, then this sentence is wrong (no one mentioned his name in his speech, and the title mentioned at the meeting is not necessarily related to their current work).
Who are the four people attending the meeting? What are their jobs now?