Math problems, who will answer math solution questions?

1,5*4*5* grams).

2,50*1 3=50 (cubic decimeter).

3, (20*16+20*4*2+16*4*2)*10=6080 (kg).

4, it should be 3cm, 3dm is impossible in decimeters.

Volume 5 4 3 3 3 33 (cubic centimeters) Surface area 5 4 2 5 3 2 3 4 2 3 2 2 66 (square centimeters).

One, 5 x 4 x 4 x grams.

Two, 1 x 1 x 1 x 50 = 50 cubic decimeters.

Three, 20 x 16 + 20 x 4 x 2 + 16 x 4 x 2 x 10 = 1280 kg.

Fourth, volume: 5 x 3 x 4 = 60 cubic centimeters.

3 x 3 x3 = cubic centimeters 60-27 = 33 cubic centimeters.

Surface area: (5 x 3 + 5 x 4 + 3 x 4) x 2 = 94 square centimeters.

3 x 6 = 18 square centimeters 92-18 = 74 square centimeters.

I'm a primary school math teacher and my answer is absolutely right.

Question 3: There must be no noodles on the top of the fish pond, so if you count one less surface, the answers to the question I have upstairs are all wrong.

1,4 squared * 5 * 4 = 120 grams.

2,50*1 cubic = 50 cubic meters. 4,

When I saw this question, I was silent for a long time, silently lit a cigarette, and tears fell from the corners of my eyes. I regret why I didn't study hard in the first place, and now I'm being asked questions on the Internet, and I don't know how to!

Answer: A1, A3, A11 are proportional series.

i.e. a11 a3 = a3 a1

It is known that a1, a3, and a11 are equal difference series.

Therefore, a1 = 2

a3=a1+2d=2+2d

a11=a1+10d=2+10d

a11 a3=a3 a1 is equal to.

2+10d) (2+2d)=(2+2d) 2 solves: (1+5d) (1+d)=1+d

1+5d=（1+d）^2

Simplified: d 2-3d = 0

, d = 3 or 0

Because d is not equal to 0

Therefore d is 3an, and the general formula is: 2+3(n-1).

Second question: b1=a1,b2=a3

Therefore b1 = 2, b2 = 2 + 3 * 2 = 8

Because bn is a proportional series.

So b1 b2 = 8 2 = 4

Therefore: bn=2*4 (n-1).

Hope it works for you.

Solution: Let the tolerance be d, a3=2+2d, a11=2+10d, and form an equal difference series from a1, a3, and a11 to obtain a1a11=a3 2, that is, 2(2+10d)=(2+2d) 2

If the solution is d=3, then an=2+3(n-1)=3n-1, so b1=a1=2, b2=a3=8, and the common ratio q=b2 b1=8 2=4, then sn=2(4 n-1) (4-1)=(2 3)*(4 n-1).

1) a1 a3 a11 is proportional, so a1*a11=a3 because of the difference, so a1*(a1+10d)=(a1+2d) solution gives d=3, an=a1+(n-1)d=2+3(n-1).

2）b1=2，b2=8，q=b2/b1=4sn=b1（1-qⁿ）/1-q）=2×（4ⁿ-1）/3

Because of the proportionality, a1 multiplied by a11 equals a3 square, and the difference is equal, a11 is equal to a1 + 10d, a3 is equal to a1 + 2d to bring in.

Let A and B each need x y days 10 (1 x + 1 y) = 5 12 20 x + 12 (1 x + 1 y) = 1 solution x = 40 y = 60 Let A and B each need m n million yuan a day m+n=80 10 = 8 20m + 12 (m + n) = 196 m = 5 n = 3 Let the cost be y where A does t days t t .

This topic applies the cosine theorem, <> hope.

The answer is as follows:

Hope, thank you!

The 0 or 1 math test will become a multiple-choice question about whether the answer is 0 or 1 as long as you encounter a question that you can't do.

f(0)=c=3, f(-1)=f(3), that is, the axis of symmetry x=(-1+3) 2=1, then -b 2=1, b=-2, f(x)=x 2-2x+3 is greater than or equal to 0, f(x)=(x-1) 2+2 0 is constant, x r

According to the title, we know: c 3

1-b 3 9 3b 3 learned b -2

If f(x) 0 then x -2x 3 0

From f(-2+x) =f(-2-x), the axis of symmetry is x = 2y, the intercept = 3, and the function f(x) =ax 2+bx+3x intercepts the line segment=2, so the intersection point with x week is x=-2+1 and x=-2-1 and x=-2-1 is substituted into f(-1) =0, f(-3) =0 to obtain a=1, b=4f(x)=x 2+4x+3

1.Because a3+a5=16, a7=17So 2a1+6d=16, a1+6d=17So a1=-1, d=3

2.From 1 an=3n-1, s10=10x(-1)+10(10-1) 2x3=125