2/5×4×3/4
( 1/ 10+ 1/5)×5
(8/9+4/27)×27
6×( 1/9×7/30)
1/6×(7-2/3)
5/6×5/9+5/9× 1/6
2/9×3/4+5/27×3/4
6/ 13×7/5-6/ 13×2/5
7/ 12×6-5/ 12×6
2 1×3/20
37×3/35
6/25×24
(3/5+7)25
3/4× 1/2+3/4×2/5
5/7-4/9×5/7
13/ 18×25×9/26
16×(3/4-5/8+ 1/ 12)
1/3+4×(5+5/ 12)
The math homework is 3/44 705/18 3/47/729/10 3/4 respectively.
Is your answer correct?
Math homework is fast. . f(x)=x
x？ +ax+b=x
x？ +(a- 1)x+b=0 has two identical roots x = a.
1-a=2a，a= 1/3
b=a？ = 1/9
M={( 1/3， 1/9)}
Math homework, Kuaikuai (1) sinx
Split into y=sinx
z=x
Because the derivative of y=sinx is cosx, and the reciprocal is 1 when x=0, but cosx monotonically decreases in the interval (0, π), and the derivative of z=x is always 1, the inequality holds.
(2)x-x？ & gt0
Extract common factor
Get x ( 1-x) >: 0
The zeros of x are x=0 and x= 1.
And according to ax? In the formula of +bx+c, it can be concluded that a is negative and the opening of the function image is downward, so the inequality is established in the interval (0, 1).
(4+8)÷
1
250000
,
= 12×250000,
=3000000 (cm),
3000000 cm =30 km,
8+(30-3)× 1.4,
=8+37.8,
=45.8 yuan;
45.8×2=9 1.6 (yuan)
Answer: It will cost Xiaoming 9 1.6 yuan taxi fare to complete this tour.
Please adopt it if you are satisfied, o (∩ _ ∩) o (∩ _ ∩) o.
Math homework is quick, quick, quick. Make a symmetrical point A' of point a relative to MN, and connect A'b and MN at point p,
Then A'B is the shortest route.
In rt △ a ′ db, a ′ b =170m is obtained by pythagorean theorem.
Help with math homework ~ quickly ~ ~ 1. If a rectangular frame is made of 100cm iron wire, its length is x cm and its area is (X (50-X)) cm 2.
Length+width = 100/2=50
Length =X, width = 50 X
Area =X*[50-X]
2. The original paddy field of a production team is x mu, which is now 70% higher than the original, so the existing paddy field is (170%x) mu. If the existing paddy field is y mu, the raw water field is (Y/( 1+70%)) mu.
Original *[ 1+70%]= current.
3. A local train departs from Station A at a speed of 60 kilometers per hour, and an express train departs from bilibili at a speed of 100 kilometers per hour. Two cars share the same journey, with the local train ahead.
If you travel for x hours and the express train catches up with the local train, the distance between Station A and bilibili is (40X) km.
At first, the distance between two cars is the distance between Party A and Party B..
If the express catches up with the local train after x hours, according to the catch-up principle,
Distance between Party A and Party B =[ 100-60]*X=40X.
Send me a message if you don't understand anything, and I will try my best to help you.
Math homework ... Walk 1.x=-4.
It took 10 minutes, that is, 600 seconds to run 3000 meters, with an average speed of 5 meters per second.
That is, the time of 6 meters per second is the same as that of 4 meters per second, which is equal to 5 minutes.
(Let the time per second of 6m be T 1, the time per second of 4m be t2, and the equation 6t 1+4t2=5(t 1+t2), we can get the solution of t 1=t2).
So 6 meters ran 6*5*60= 1800 meters per second.
3. The annual profit is 200,000 * (4-2.3)-200,000 * 4 *10% = 260,000.
If it is used for x years, it is 400,000 * (1+0.15x) = 260,000 * x.
X=2, so it takes 2 years to pay off in one lump sum.
Come on, come on, synchronize your math homework! 2. The quantitative relationship between two paragraphs is 2CM:4CM.
Don't change.
Divide ∠EBA and ∠FAB equally with AC and BC.
∠ 1 = 1/2∠FAB = 1/2(α+∠ABO)，∠2 = 1/2∠EBA = 1/2(α+∠BAO)
∴∠ 1+∠2= 1/2(2α+∠abo+∠bao)= 1/2(2α+ 180-α)= 90+ 1/2α
∴∠c= 180-(∠ 1+∠2)= 90- 1/2α
Math homework is calculated by Vieta theorem, and the answer is 10. Hope to adopt!