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Anonymous users2024-02-15f(x)=(x-1) 2+1 The axis of symmetry is x=1 1 [-1,4]f(1)=1 f(-1)=5 f(4)=10 maximum: f(4)=10;The minimum value f(1)=1f(x)=(x-1) 2+1 The axis of symmetry is x=1 When t 1, [t,t+1] is to the right of the axis of symmetry, and the minimum value is obtained at x=t.
g(t)=f(t)=t^2-2t+2
When t+1 1 is t 0, [t,t+1] is on the left side of the axis of symmetry, and the minimum value is obtained at x=t+1.
g(t)=f(t+1)=t^2+1
When 00 is a>0, the distance from the axis of symmetry to x=-2 is longer than the distance to x=2, and the maximum value is obtained at x=-2.
g(a)=f(-2)=-2a+7
When a=0, the maximum value, g(a)=f(-2)=f(2)=11
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Anonymous users2024-02-14For all three of these problems, you can function as f(x)=(x+a) 2+b, and then consider defining the domain with respect to the distribution of the axis of symmetry, and discuss the magnitude of the values.
Take problem 1 as an example: f(x)=(x-1) 2+1 The axis of symmetry is x=1, so when x=1 is the minimum f(1)=1, the maximum is f(4)=10
And so with that, try to do the math yourself, and it's pretty simple.
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Anonymous users2024-02-13The amplitude of U is 10 2V, the RMS is 10V, the angular frequency is 341rad s, the frequency is 50Hz, the period is, and the initial phase is 30. The amplitude of i is , the effective value is , the angular frequency, frequency and period are the same as u, and the initial phase is -60.
U ahead of i90
The waveform diagram is shown at **.
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Anonymous users2024-02-121.Grill 200
2.Feast 12
3.It's hard to write, let's dictate: -1004 plus or minus the stove rent silver number (1004 square -1).
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Anonymous users2024-02-111da.The pliers are long handles and the pliers are short, so they are labor-saving levers.
Hair scissors are generally long scissors, and the handle is short, which can be seen as a laborious lever, so a no.
b.The wheelbarrow is labor-saving, and the shovel is laborious, so B is also wrong.
c.Tweezers are laborious, and screwdrivers are labor-saving, so C is also wrong.
d.Both are labor-saving, so choose D
2c300n
The length of the pipe is l meters, and the force required to lift one end is f
From the knowledge of physics, it can be known that the arm that lifts one end is l; The force arm of gravity is at the center point of the tube, and the force arm is l 2
According to the principle of force-distance equilibrium, it can be obtained:
g(gravity 600n)*l 2=f*l
So, f at least = 300n
3aBecause the place where the food is picked is on the chopsticks.
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Anonymous users2024-02-101d is all labor-saving leverage, 2 I think is c, 3 is a
16a^4-b^4
4a²+b²）（4a²-b²） >>>More
Original content of the textbook:
Reason: At the end of the 15th century, the extensive development of the commodity economy and the continuous expansion of exchange in Western European countries made ** the most important means of payment in commodities**, and ** in Eastern countries became the dream of Western Europeans. >>>More
1 Xiao Xu, who was not admitted to university, was rejected to arrange a job for Sanbo, and after returning home, he successfully started his own business with the support of his mother, only to know that Sanbo was a benefactor who inspired him to study and start a business. (3 points). >>>More
Isn't this taking off your pants and farting?! That's! Put it in a beaker and call it over?! Also scientific, contrary to the principle of life, shit logic. These 2B competition questions really hurt the thinking of Chinese students.
That moment refers to when I listen to my own heartbeat with a stethoscope.