Extract common factor

2、 1/8040。

Fractional column item

Learning and thinking about the Hope Cup public welfare class, the first lecture, example 2, adaptation.

3、。

Find a pattern

The first exam in 2009, question 5.

In the circulating decimal, move the point representing the circulating segment to a new position. The number at the position of 20 1 1 after the decimal point of the new circulating decimal is 6, so the new circulating decimal is _ _ _ _ _ _ _ _.

4、98。

number theory

5、6。

Find a pattern

6、①。

Geometric stereogram expansion diagram

Learn and think about the eraser method learned in the third lecture of Hope Cup public welfare class

Training 100 question 5

The expanded diagram of the square shown in figure 1 is _ _ _ _ _ _ _ (fill in the serial number).

7、 150。

Xingcheng recreation and sports

8、 1; 6/7。

Define a new operation

Learning and thinking about the hope cup, the first lecture, the second expansion question

"△" is a new operation, which stipulates: A△ B = A× C+B× D (where C and D are constants), such as 5△ 7 = 5× C+7× D, and 6△/Kloc-if1△ 2 = 5,2△ 3 = 8.

9.a； 0.5。

Percentage application problem

Learning and thinking about the Hope Cup public welfare class, lecture 3, example 2: original price 100 yuan.

10、35。

count

1 1、3 1。

estimate

12、5

13、2。

Geometric curve region

EFGH， 14 .

Geometric model

15、4; 50。

Clock problem

Learn to think about the Hope Cup public welfare class, lecture 3, expansion question 5.

20 12 hope cup training 100 original title of question 52

At 7 o'clock in the morning, 10, his mother woke Xiao Qiang up and told him to get dressed and get ready for school. But Xiao Qiang saw that the hands of the clock in the mirror didn't point to the time to get up. Xiao Qiang thought it was _ _ _ _ _ _ _.

16、29。

count

17、 13。

Counting enumeration

18、 180。

Engineering problems

19、39; 60。

average number

20、227; 22 1。

Looking for Invariants in Application Problems