(1) The area of each brick is fixed, and the occupied area is proportional to the number of blocks (
Positive proportion.
(2) The total number of students in each grade is certain, and the number of students in each class is (
counter
) proportion.
(3) If 8/x=y(x is not 0), then x and y become (
counter
) proportion.
2. Give a sentence.
(1) The divider is fixed, and the upper river divisor is inversely proportional.
(√
)
(2) Weight is directly proportional to age.
(×
)
(3) The sugar content of sugar water is constant, and the sugar water ratio is typical.
(×)
(4) The orientation is directly proportional to the river.
The circumference of a square is proportional to the length of its sides.
(√
)
(5) The area of a circle is proportional to its radius.
(
×
)
(6) The area of a triangle is constant, and its base and height are typical proportions.
(
√)
4. Complete the relationship according to the relationship among the three quantities of rectangular area, length and width.
(
zone
) (for sure), (
long
) and (
extensive
) become (
counter
) proportion;
(
long
) (for sure), (
zone
) and (
extensive
) become (
straight
) proportion;
(
extensive
) (for sure), (
zone
) and (
long
) become (
straight
) proportion.
5. For a fraction, the difference between denominator and numerator is 12, and the ratio between numerator and denominator is 1: 4. What is the score?
12÷(4- 1)=4
denominator
4× 1=4
molecule
4×4= 16
mark
4/ 16
Problem supplement
20 10-03-23
20: 14
3. Total price/yuan | 12
24(36)44
(
160)
6 12
|
Because the unit price = 12/3=4
So (upper) total price = (lower) quantity ×4.
Quantity/Unit |3
(6)
nine
( 1 1)40
( 153)|
This is a grid.
I can't type it.
This is the only way to play.
I hope you can understand.
x|3
|4
|6
(
eight
)
12
|48|
144
y|24
(
18
)
12
|9
(6)
( 1.5)
(0.5)
X and y are inversely proportional.
x
y=72