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Given that points a, B and C are three points on the number axis, the number corresponding to point C is 6, BC = 4, ab = 12. (1) find the number corresponding to points a and B. (2) the moving points P and Q start from a and C at the same time. They move along the positive direction of the number axis at the speed of 6 units per second and 3 units per second, respectively. M is the midpoint of a and P, n is on C and Q, and CN = one third CQ. Let t (T > 0) be the moving time, When the number corresponding to n (expressed by the formula containing T) is the value of T, OM = 2bn
A -10
B 2
(2)P=6T-10 M=3T-10
Q=3T+6 N=T+6
OM=3T-10 BN=T+4
3T-10=2(T+4)
T=18
As shown in the figure, given that points a, B and C are three points on the number axis, O is the origin. The number corresponding to point C is 6, BC = 4, ab = 12 (1) (2) starting from a and C, the moving points P and Q move along the positive direction of the number axis at the speed of 6 units and 3 units per second respectively. M is the midpoint of AP, n is on CQ, CN = 13cq, and the motion time is t (T > 0). ① find the number of corresponding points m and n (expressed by the formula containing T); & nbsp; ② when t is the value, OM = 2bn
(1) The corresponding number of ∵ point C is 6, BC = 4, ∵ point B represents 6-4 = 2, ∵ AB = 12, ∵ point a represents 2-12 = - 10. (2) ① the ∵ moving points P and Q start from a and C at 6 units and 3 units per second respectively, time is t, ∵ AP = 6T, CQ = 3T, ∵ m is the middle point of AP, n is on CQ, and CN = 13cq, ∵ am = 12ap = 3T, CN = 13cq ∵ T, ∵ point a represents - 1 2 ∵ om = | - 10 + 3T |, BN = BC + CN = 4 + T, OM = 2bn, | - 10 + 3T | = 2 (4 + T) = 8 + 2T, t = 18 from - 10 + 3T = 8 + 2T, t = 25 from - 10 + 3T = - (8 + 2t), so when t = 18 seconds or T = 25 seconds, OM = 2bn
Quadratic radical addition, subtraction, multiplication and division
①（2 √2-1）（2√2+1）②（2√x+√y）（√4x-√y）③（3√2+2√3）（3√2-2√3）④（3-√3）（1+1/√3）⑤（1+√2）²（1-√2）²
①（2 √2-1）（2√2+1）=(2√2)²-1=8-1=7②（2√x+√y）（√4x-√y）=(2√x)²-(√y)²=4x-y③（3√2+2√3）（3√2-2√3）=(3√2)²-(2√3)²=18-12=6④（3-√3）（1+1/√3）=1/3(3-√3)(3+√...
Let f (x) = root sign (ax × x + BX + C) (a is less than 0) be defined as D. if all points [S, f (T), (s, t belong to d)] form a square area, find the value of a?
What is electric power? What is its unit and formula? How should it be applied?
Please answer quickly, good brothers and sisters, help me solve it quickly!
The calculation formula of electric power is: P = w / T = UI, where p stands for electric power, w stands for electric work, t stands for time; u stands for voltage, I stands for current
Its physical meaning is: the power on a circuit is proportional to the voltage at both ends of the circuit and the current intensity in the circuit
In addition, the unit of electric power is watt (W), the unit of electric work is Joule (J), and the unit of time is second (s); the unit of voltage is volt (V), and the unit of current is ampere (a)
Licocap original post!
1.﹙√a³x-3ax﹚÷√ax
2.√(2/3m)÷√6m×√8m³
1.﹙√a³x-3ax﹚÷√ax
=a-3√ax
2.√(2/3m)÷√6m×√8m³
=√4m×m³
=2m²
Find the range of y = 2 + cos2x / 2-cos2x
Y = 2 + cos2x / 2-cos2x = (4-2 + cos2x) / (2-cos2x) = 4 / (2-cos2x) + (- 2 + cos2x) / (2-cos2x) = 4 / (2-cos2x) - 1-1 ≤ cos2x ≤ 11 ≤ 2-cos2x ≤ 3, so 1 / 3 ≤ 1 / (2-cos2x) ≤ 1, so 4 / 3 ≤ 4 / (2-cos2x) ≤ 4, so 1 / 3 ≤ 4 / (2-cos2x) - 1 ≤ 3
In the formula P = u2r for calculating electric power, u is the voltage value applied at both ends of the consumer, and R is the resistance value of the consumer, then this formula can be used for ()
A. Calculate the power of refrigerator B. calculate the power of electric fan C. calculate the power of electric iron D. calculate the power of all electrical appliances
A refrigerator is not a pure resistance circuit, so this formula can not be applied. So a error & nbsp; & nbsp; B electric fan is not a pure resistance circuit, so this formula can not be applied. So B error & nbsp; & nbsp; C electric iron is a pure resistance circuit, so this formula can be applied, so C is correct & nbsp; d this formula is only applicable to pure resistance circuit, and does not calculate the power of all electrical appliances
Quadratic radical addition, subtraction, multiplication and division
①（2 √2-1）（2√2+1）②（2√x+√y）（√4x-√y）③（3√2+2√3）（3√2-2√3）④（3-√3）（1+1/√3）⑤（1+√2）²（1-√2）²
(1) The original formula = (2 √ 2) &# 178; - 1 = 7
(2) The original formula = (2 √ x) &# 178; - (√ y) &# 178; = 4x-y
(3) The original formula = (3 √ 2) & # 178; - (2 √ 3) & # 178; = 6
(4) The original formula = (3 - √ 3) (1 + (√ 3) / 3) = 3 + √ 3 - √ 3-1 = 2
(5) The original formula = (1 - (√ 2) &# 178;) &# 178; = 1
①：7,
②：4x-y
③：6
④：2
⑤：1
These questions are calculated by square difference.
The range of sincosy = 2x - 3
= 1-2(sinx)^2+2sinx -3
=How to calculate the range of - 2 (sinx-1 / 2) ^ 2 - 3 / 2 [- 6, - 3 / 2],
y= -2(sinx-1/2)^2 - 3/2
Because - 1
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