Find a solution to a math problem!

Oh, first of all, I hope it can help you, this is simple, let's tell you this, the first number is not zero, then it can be any one of 1-9, that is, nine possibilities, and the second number, you can use any of the remaining of the first number, this time can also include zero, so it is also nine possibilities, and the third number, since the first and second use two, the third number can only use the remaining eight numbers, so there are a total of 9x9x8 possibilities, that is, 648 possibilities, Hope it helps!

The first can have 1-9 9 kinds.

The second place is not 0, there are 8 types.

In the case of を 1 kind.

3rd digit There are 8 types (can be 0) in the case where the second digit is not 0 In the case of the second digit is 0, there are 8 types.

So there is a total of 9*8*8+9*1*8=9*9*8=648

The first number is not zero, then it can be any one from 1 to 9, that is, nine possibilities, and the second number, which can make any of the remaining of the first digit, can also include zero this time, so it is also nine possibilities, and the third number, since the first and second use two, the third number can only use the remaining eight numbers, so there are a total of 9x9x8 possibilities, that is, 648 possibilities, I hope it can help you!

The first question is that the value of what is asked cannot be seen.

Q2: p(x,x(-8,0); s=|oa|×(

The third question: ... How much area, I can't see it.

1.Substitution point e(-8,0).

0=-8k+6

The solution is k=3 4

2.From the above question.

The analytic formula is y=3 4x+6

Let the point p be (x,3 4x+6).

s△opa=1/2×ao×（3/4x+6）=9/4x+18（-8＜x＜0）

y=0 is substituted for y=kx+6

0=-8k+6

k=¾∴y=¾x+6

s△opa=½×oa×y

i.e. 6 y=27 8

y=9/8x+6=9/8

x=-13/2

When p(-13 2,9 8), the area of the OPA is twenty-sevenths of an eighth.

1.The brought in coordinates e have 0=-8k+6, k=3 42It is known that OA is a fixed value = 6, so to express the change of the height on the side of OA, we know that the coordinates of the point P are (X, Y), because the point P is in the second quadrant, so Y>0, so the height is Y, so there is S=1 2*6*Y=3Y, S=3Y, and 6>Y>0, 6 is obtained from the coordinates of the F point.

3.That is, y=(27 8) 3=9 8 (obtained from the equation solved above), there is y, and substituting the equation y=3x 4+6 has: 9 8=3x 4+6, x=-13 2 can be solved

I don't know how to talk about it yet.

Suppose the number of bags containing the combustion-based key was x, then the mule was x+1, x-1)*2=x+1

x=3

Set up a donkey head Sakura Liang Song's x bag, a mule pack Y bag, and the width of each bag m is (x-1) m = 2m (y + 1).

x+1）m=（y-1）m

The solution is x=3y=5

(1) What is the sum of the reciprocal of 15 and 1 5?

2) The reciprocal of a number is 6 7, what is 6 7 of this number?

3) Is the product of the reciprocal of 1 2 and the reciprocal of the reciprocal said to be less?

8(4)How many 2 5s are in 8(4)8?

8 2 5 = 20.

5) A number of 24 25 is 12, what is this number?

6) A number of 5 6 is 3 4, what is this number?

7) What is the difference between the quotient of 8 3 4 and subtracting 3 5 divided by 2 3?

Write the equation according to the conditions:

The store shipped 500 kilograms of apples.

1) There are 1 5 more pears than apples, (500 (1+1 5)=600 kg).

2) 1 4 less than pears, (500 (1-1 4) = 2000 3 kg );

3) 60 kg more than the pear's 4 5, (500-60) 4 5 = 550 kg (4) The pear is 60 kg less than the apple's 4 5, 500 4 5-60 = 340 kg.

1.。1/15+1/5=1/15+3/15=4/152。.The reciprocal of a number is 6 7, then the number is 7, 6, 7, 6x6, 7 = 1, the reciprocal is 2, and the reciprocal is 4, 2x4=8

Divide by 2 5=20 so there are 20.

5。The 24 25 of a number is 12 12 divided by 24 25 = 25 2 = 6. The sum of 5 6 of a number is 3 4 3 4 divided by 5 6 = 9 10 3 4 is 3 4x8 = 6 , 3 5 divided by 2 3 = 9 10 6-9 10 = 5 and 1 10

500x（1+1/5）

500 divided by (1-1 4).

500-60）x5/4

500x4/5-60

The coordinates of the true line y=kx+6 and the x-axis y-axis intersecting the point e are (-8,0).The coordinates of point A are (-6,0).

1) If the point p(x,y) is a moving point on a straight line in the second quadrant, when the point p is in motion, try to write the functional relationship between the area s of opa and x, and write the range of the value of the independent variable x;

2)**: When P moves to what position, the area of the OPA is 27 8 and the reason is stated.

Substituting e(-8,0) into the straight line y=kx+6 yields:

0=-8k+6, solution: k=3 4

So the straight line is: y=3 4x+6

That is, the p-coordinate is: (x,3 4x+6).

So: the area of opa is: s=1 2*|oa|*|yp|=1/2*6*(3/4x+6)=9/4x+18

The value range of x is: -8(2)s=27 8 is substituted into the above equation to obtain:

27/8=9/4x+18

x=y=3/4*(

That is, when the point p moves to (, 9 8), the area is 27 8

Once a function, the following few play well.

The current planting area: 10 + 10 x 60% = 16 acres.

The yield per mu of pumpkin this year is: 44800 16=2800 kg mu.

Growth rate: (2800-2000) 2000=40%The area growth rate is how much the area has increased by 10% compared with last year.

The growth rate of yield per mu is x

The growth rate of the area is 2x

10 + 10 * 2x) (2000 + 2000 * x) = 60000 solution. x=-2 or x=

There are questions available. x=-2

Off topic. So x=

Let the equation for the straight line be y=kx+b

Let x=0 and y=b

When y=0, kx+b=0 x=-b k

Because the cross-section and longitudinal intercepts are equal.

then there is b =|b/k|You can make an appointment to |b|

Gotta |k|=1

k=1 or k=-1

When k=1.

The equation for a straight line is y=x+b

Because of the point p(3,-4).

then there is -4=3+b b=-7

So the equation for a straight line is y=x-7

In the same way, when k=-1, the linear equation is y=-x-1