1. If 2km to the east is marked as+2km, then-3km means (
).
(a) Drive eastward for 3 kilometers.
(b) Drive south for 3 kilometers.
Go west for 3 kilometers.
Go north for 3 kilometers.
School, home and bookstore are located in a north-south street in turn. The school is 20 south and the bookstore is north 100. Zhang Ming starts from home, goes north for 50, and then goes north for -70. At this time, Zhang Ming's position is
(
).
(1) At home
(2)
school
(3)
bookshop
(4)
Not up there.
3. One of the following categories must be correct (
).
(1)
(2)
(3)
(4)
4. If
The reciprocal of is 3,
, then
The value of is (
).
(1) -8
(B)2
(C)8 or -2
(d)-8 or 2
5. If
, then the following relationship is correct (
).
(1)
(2)
(3)
(4)
In 2007, Chang 'e-1 satellite of China's lunar exploration project will be launched to the moon. It is known that the distance from the earth to the surface of the moon is about 384,000 kilometers, so this distance should be expressed by scientific notation (three significant figures are reserved) (
).
(A)3.84 times
kilometre (km)
(B)3.84 times
kilometre (km)
(C)3.84 times
kilometre (km)
38.4 times
kilometre (km)
7. If
It's a cubic trinomial
Equal to (
).
1
1
(C)- 1
(d) None of the above is true.
8. Established the following types (
).
(1)
(2)
(3)
(4)
9. After the price of a certain brand of color TV sets is reduced by 30%, the price of each set is
Yuan, the original price of each color TV of this brand is (
).
(1) 0.7a yuan
30 million yuan
(3)
Yuan dynasty (1206- 1368)
(4)
Yuan dynasty (1206- 1368)
10. A column of numbers: 0, 1, 2, 3, 6, 7, 14, 15, 30, _ _ _ _ _ _ _ _ This string of numbers is written by Xiao Ming according to certain rules.
).
(A)3 1.32，64
(B)3 1.62，63
(C)3 1.32，33
3 1.45，46
Second, fill in the circle (3 points for each small question, 30 points for * * *)
1.
The antonym of is
The reciprocal is
; The number whose absolute value is equal to 3 is
.
2. If m and n satisfy
=0, then
3. If
Is any two numbers that are not equal to zero, and the operation ○+is defined as follows (other symbols have the same meaning as usual):
○+b=
, then [( 1○+2)
○+3]-[ 1 ○+(2 ○+3)] The value is _ _ _ _ _ _ _ _.
4. Use a calculator to calculate (keep 3 significant figures):
=
.
With the help of Project Hope, some out-of-school children in a province in western China entered Hope Primary School in recent three years.
People, this data is an approximate figure obtained by rounding, and it has _ _ _ _ _ significant figures, accurate to.
A little.
6. Single item
-
The coefficient of is
, the number is
.
7. If
Is a similar project, and then
=
.
8. When ...
=2, algebraic expression
The value of is equal to-17, then when x =- 1
The value of is equal to _ _ _ _ _ _.
9. A three-digit and ten-digit number is
The number in the hundredth digit is twice as large as the number in the tenth digit, and the number in the single digit is two times larger than the number in the tenth digit.
.
10. (Lushun city) Xiao Wang designed a calculation program with a computer. Input and output data are as follows:
invest
…
1
2
three
four
five
…
output
…
…
Then, when the input data is 8, the output data is
.
Third, answer with your heart (***40 points)
1.( 10 minute) Calculation: (1)
(2)
.
2.(7 points) When
Time, find algebraic expression
The value.
3.(7 points) There is such a question: "Calculation.
The value of, where
"
. A classmate put "
"Wrong copy"
",but the result of his calculation is also correct. Try to explain why.