Grade 6 Mathematics Finding Empty Gains and False Gains, Finding Empty Questions Grade 6 Mathematics

Fill in the blanks for 2 of the 4 questions or s=(1 4) r (r is the diameter of the circle).

Question 1 of the five major questions: In the same circle, the radius is enlarged or contracted by (x) times, the diameter and circumference are enlarged or contracted by (x) times, and the area is enlarged or contracted by (x) times.

For example, in the same circle, the radius is enlarged by a factor of 4, the diameter and circumference are enlarged by a factor of (4), and the area is enlarged by a factor of (16) (note: it is 4 times the expansion factor 4 above, i.e. x times the multiples of x).

2 sub-questions of the five major questions: The radius ratio of two circles is equal to the diameter ratio (and) the circumference ratio and the area ratio (equals) the square of the above ratio.

For example, if the radius ratio of two circles is 2:3, then the ratio of diameter and circumference of the two circles is 2:3, and the area ratio is (4:9).

1. True/False questions.

1. Correct. 2. Correct.

3. Error. 4. Error.

5. Error. 6. Correct.

7. Correct. II

1、b2、a

Let the side length of the square be r, then its area is r, and the diameter of the circle is r, then the area of the circle is *(1 2)r) that is, (4)r and is approximately equal to less than 4, then (4) in (4)r is less than 1, so the area of the square r is greater than the area of the circle (4)r).

3. The radius of the circle is expanded by 3 times, and its circumference is expanded by (3) times.

3. 1. The (fractional) ...... of the circumference angle(fractions) of the area of the circle

2. (Maximum) (Minimum).

II3 .3 times.

III. 11 2 Circle Center Angle 360

2.Maximum, Minimum.

It is simplified than the relationship with division and the invariant nature of the quotient.

(5) The simplest integer ratio is 8:1;

7) The relationship of division, the basic nature of the ratio.

Unary means that there is only one unknown quantity, i.e. x or y, and there can be only one.

Once means that an unknown quantity can only be a power of one time, not a square or a cube.

Based on this, it can be judged.

3x-4y 2 has two unknowns Wrong.

3-2 x 5 wrong (x can only be a numerator, otherwise it would be a negative exponential power) 3x 0 right.

x2-11 5x x belt squared wrong.

A is a binary one-time inequality.

b is actually x (-1) power, so it's not either.

c Correct solution. d You may be typing wrong, the left should be x 2-11, which is a quadratic inequality.

The answer is c

ca has x and y, which is binary.

b x is on the denominator and is a fraction, not a once.

D x 2 is quadratic, not primary.

20% off is 80%.

Set the original price to $x.

x times 80% = 106

x = 106 divided by 80%.

The concept is the concept on the copy, and the next question is best to list the original price of the equivalent relationship 80% = current price.

80% = $106.

Columnable equations, can be extrapolated.

106 80% = yuan.

By adding two units, 1 9 can be saved, and the original machine can be obtained, a total of 16 machines, and then the original time is t to obtain 14 * (t + 3 4) = 18 * 8 9t to obtain t = 21 4

The answer is t 16

That's 21 64