1. Calculation1996+1997+1998+1999+2000+2001= (1/kloc-)

Original formula = (1996+2001)+(1997+2000)+(1998+1999).

=3997*3

= 1 199 1

2. Calculate 9999×5555÷3333=( 16665)

The original formula = 9 *111* 5555 ÷ 3 ÷11.

=3*5555

= 16665

3. Saw a piece of wood with a length of 3 meters and 50 centimeters into small pieces with a length of 50 centimeters, and saw it (6 times).

3 m 50 cm =350 cm

Need to saw: 350÷50- 1=6 times.

4. There are two groups of cards. The first group is 3, 5 and 7. For the second groups 2, 4 and 8, now take a card from each group and calculate their sum. There are at most (6) different sums.

Minimum 2+3=5

Maximum 7+8= 15

And it can only be odd.

At most: (15-5)/2+ 1=6 kinds.

5. There are 2000 black beads and white beads, arranged according to the following rules:

○○○○○○○○○○○○○○○○○○○○○○○○○○○○○967

Except the front 1, the back 1, black and white, 4 in each group.

2000- 1= 1999

1999÷4=499 Yu 3

The 2000th is the third in the 500th group, and it is white.

6. In the following formula, the four digits represented by "love mathematics" are (2 156).

Easy to calculate, do it yourself.

7. The father is 28 years older than his son. Next year, the father will be five times as old as his son. This year, the father is (34) and the son is (6).

Next year, the father will still be 28 years older than his son.

Son next year: 28÷(5- 1)=7 years old.

This year,

Son: 7- 1=6 years old

Father: 6+28=34 years old

8. As shown below, a square hall is divided into 16 cubicles, and every two adjacent cubicles can communicate with each other. The four black cubicles diagonally opposite each other are lounges, and the rest are exhibition rooms. Starting from A, there are () different ways to get to the lounge to make the room pass the least.

No pictures?

Second, answer the question.

1. In the first three days, the machinery factory processed 1259 parts on average every day, and processed 5379 parts in the last four days. How many parts are processed on average every day this week?

A * * * has been processed:

1259*3+5379=9 156.

Average daily throughput:

9 156÷7= 1308

The road team built two sections of roads in four days. The first section is 430 meters long and the second section is 250 meters long. How many meters are repaired on average every day?

(430+250)÷4= 170

3. Group A, Group B, Group C and Group D participate in track and field competitions. Team a 1 14, team b10, team c 186 and team d 178. What is the average score of the four teams?

(114+210+186+178) ÷ 4 =172

38 Young Pioneers from Dongcun Primary School planted castor on campus and roadside. 190 trees were planted on the roadside, and the number of trees planted on campus was three times that on the roadside. How many castor trees are planted per person on average?

190×( 1+3)÷38=20 trees.

There is a box of black and white chess pieces, and the number of sunspots is twice that of Bai Zi. If you shoot four sunspots and three Bai Zi at a time, there will be 16 sunspots left after shooting the albino star. Q: How many black-and-white film?

If you take three Bai Zi at a time, 3*2=6 sunspots,

Then the albino body is finished, and the sunspot is just finished.

Now 6-4=2 sunspots are shot less each time, leaving 16 sunspots.

So a * * * shot: 16÷2=8 times.

Bai Zi oil: 8×3=24 tablets.

There are 24×2=48 sunspots.

6.A, B and C save, A saves 1240 yuan, B saves less than A 70 yuan, and C saves more than B 50 yuan. Find the average savings of a, b and c.

B:1240-70 =1170 yuan.

C:1170+50 =1220 yuan.

Average of three people: (1240+1170+1220) ÷ 3 =1210 yuan.

7. The average of A and B is 72, and C is 18. What is the average of a, b and c?

(72×2+ 18)÷3=54

8. The average of A and B is 30, the average of B and C is 34, and the average of A and C is 32. Find the average of three numbers a, b and e.

(30×2+34×2+32×2)÷2÷3=32

9. There are three numbers A, B and C. The average of A and B is 97, the average of B and C is 132, and the average of A and C is 125. Q: What is the average of these three numbers?

Ditto.

(97+ 132+ 125)÷3= 1 18

10, Xiao Gang tested me, with an average score of 85 in the first two times and 90 in the last three times. What is the average score of Xiaogang's exams before and after?

(85×2+90×3)÷(2+3)=88 points.