Can anyone tell me the answer to the calculation of a few math problems in a hurry

2.Apple: 60Pear: 120The third type: 180

3.It is about 678 yuan.

5.West; 360.Yellow; 432.Earth; 108.

7.Approximately.

1, 60 * 100 * 12 = 72000cm = 720m2, set three kinds of trees for a total of x.

1|3x +1|6x =180

x=360 pear tree 1|3x=120 apple trees: 180-120=60 trees, 360-180=180 trees.

3,300*60%* Let's do the math for yourself.

4, (squared * = the result is your own calculation.

I don't know if you still want to, just in case you need to talk about it halfway first, I'll continue.

Rice. 2.Apple: 60 trees. Pears: 120 pears. The third type: 180 trees.

3.It is about 678 yuan.

5.West; 360.Yellow; 432.Earth; 108.

7.Approximately hours.

Person. Be sure to remember to add units, and answer.

60* There are x trees in total.

x/6+x/3=180

Solution: x=360

300*40%*RMB.

Square metre.

Find the radius first. Then find the wheel axle length, then 100, find out how many meters you walk in a minute, and then 12

56m divided by 10, divided by 2, after finding the radius, find the area.

2 5 Find tomatoes, (900-tomato area) (4+1)*4: cucumber, (900-tomato area) (4+1)*1: sweet potato.

2.Apple: 60Pear: 120The third type: 180

3.It is about 678 yuan.

5.West; 360.Yellow; 432.Earth; 108.

7.Approximately.

It takes 30 seconds to watch a butanci, and 60 times is 1800 seconds.

30*60=1800 seconds).

However, after the unit conversion of burning, 1800 seconds is 30 minutes.

Section: Tong 1800 60 = 30 minutes).

Solution: This question examines the sine theorem and the cosine theorem.

Hope.

2.Merge the left side of the equal sign into x 2-

3=x-2 and then turns into x 2-x-1=0

The constant term is -1 first, and c is chosen

3.According to the two roots of the binary linear equation, x1*x2=c a=(a 2-1) (a-1)=a+1

He said that there is a root of 0, so x1*x2=a+1=then observe the problem, when a=1, this equation becomes a univariate equation x=0, so choose c

4.Numbers that are opposite to each other are 4x 2-

2x-5=-(2x^2+1)

Then move the term 6x 2-2x-4=0

Approximately 3 x 2-x-2 = 0

It is then factored using the cross multiplication method.

3x+2）（x-1）=0

Answer: Choose b, the figure below, and the question can be directly broken down by a completely square formula, if x+2 is considered a.

It becomes a 2-10a+25=0.

Directly with the perfect square formula (a-5) 2=0

Then it's a=5.

Then substitute a=x+2.

x+2=5x=3

Question 4: They are the opposite of each other.

Their sum is zero, and the equation can be solved.

x+2-5=0, i.e. x=3

4. Opposite to each other, it is and.

02x^2+1+4x^2-2x-5=0

6x^2-2x-4=0

3x^2-x-2=0

Then use the cross multiplication.

x-1）（3x+2）=0

x=1 or. x=-2/3

3. Let x+2=m

The original formula becomes.

m^2-10m+25=0

m-5)^2=0

m-5=0m=5, that is.

x+2=5x=3

(1) It will be expressed in degrees, minutes, and seconds °+4312〃==3 °43′.12〃

2) 52°13 48 52°13 48 = 52° (3) 31°56 3 = 10° 38 40 (4) (5) in degrees

3 degrees, 43 minutes, 12 seconds.

10 degrees 20 minutes and seconds.

3 degrees 59 minutes 36 seconds.

67 degrees, 30 minutes, 0 seconds.

It's good to use a calculator, it's really fun for children. Note that each unit is converted to 60.

The guy above has been solved, there's no need to do it again :)

a b-b a-(a 2 + b 2) ab divides it into (a 2-b 2-a 2-b 2) ab and then simplifies it to -2b a

Because (a+b) 2=a 2+2ab+b 2, ab=[(a+b) 2-a 2-b 2] 2 is substituted into 3a 2+ab-2b 2=0 to obtain: 3a 2+[(a+b) 2-a 2-b 2] 2-2b 2=0

So [6a 2+(a+b) 2-a 2-b 2-4b 2] 2=0 so 6a 2+(a+b) 2-a 2-b 2-4b 2=0 so 5a 2-5b 2+(a+b) 2=0 so 5(a 2-b 2)+(a+b) 2=0 so 5(a+b)(a-b)+(a+b) 2=0 Situation: 1When a+b is not equal to 0, the formula divides a+b at the same time to obtain 5(a-b)+(a+b)=0

Deparentheses: 6a-4b=0

So b=3a2

So b a=3 2

So -2b a = -3

2.When the bend is a+b=0, there is a=-b

So -2b a=2

To sum up: a b-b a-(a 2 + b 2) ab has a value of -3 or 2a

bcab-bc-ac=1/2(2ab2c

2ab-2bc-2ac)1/2(a

b2ab+b

c2bc+ac

2ac)1/2[(a-b)

b-c)a-c)

Substitute ABC for obtain.

Original = 1 2 [1

x=( Zheng Zhi 5-1) 2

2x+1=√5

Square on both sides. 4x^2+4x+1=5

4x^2+4x=4

x^2+x=1

x^4+x^2+2x-1

x^4+x^3-x^3+x^2+2x-1

x^2(x^2+x)-x^3+x^2+2x-1x^2×1-x^3+x^2+2x-1

x^3+2x^2+2x-1

x^3-x^2+3x^2+2x-1

x(x^2+x)+3x^2+2x-1

x×1+3x^2+2x-1

3x^2+x-1

3x^2+3x-2x-1

3(x^2+x)-2x-1

3×1-2x-1-2x+2

4，(x-1)(x-2)(x-3)(x-4)[(x-1)(x-4)][x-2)(x-3)](x^2-5x+4)(x^2-5x+6)

x^2-5x)^2+10(x^2-5x)+24x^4-10x^3+25x^2+10x^2-50x+24x^4-10x^3+35x^2-50x+24

2x+y+6≥6+2√2xy

xy≥6+2√2xy

xy-√2)^2≥8

xy-2 2 2 or xy-2 -2 2 (impossible) so the xy minimum is (3 2) 2=18

--Please see the following standard answer:

Solution: Using the fundamental inequality a+b 2 (ab), so that a=2x, b=y, then there is xy=2x+y+6 2 (2xy)+6, so that xy=t, we get t -2 2) t-6 0

That is, (t-3 2)(t+ 2) 0 can be solved: t 2, t 32 and t 0 is noted, so the solution t 3 2, so xy 18

So the answer should be 18

Set up the production of travel pencils x branches, ballpoint pens y y branches, fountain pens z branches, from the title of the meaning, because the number of large eggplants after production is the same, so x=y=z

x+y+z=1250000