Assuming that a and B are shaping variables, it is necessary to rewrite the mathematical expression 1 / AB into C language expression

It's better to be 1.0 / (a * b), but if so (double) (1 / (a * b)) should be OK

In C + +, find the value of the following expression: (1) a = 3 * 5, a = b = 3 * 2 (2) a / = a + a \ \ define a as an integer variable and the value is 12
I am a college student beginners, please explain the process of thinking. Is not to understand how to calculate the computer!
Why isn't the first one 1 5? What does the slash after the second a stand for?

(1) A = 3 * 5 = 15, and then a is assigned, a = 2 * 3 = 6
(2) A / = a + a means a = A / (a + a), a = 12 / 24, and because a is an integer, a = 0

14. The putchar function can output a (). A. integer variable expression value B. real variable value C. string D. character or character variant to the terminal
14. The putchar function can output a () to the terminal
A. Integer variable expression value B. real variable value C. string D. character or character variable value

It is known that the circle O is the outer center of the triangle ABC, the Noor angle a = 180 ° and the degree of the angle BOC is calculated

Because the central angle of the circle opposite to the same arc is equal to twice the circumference angle,
Moreover, ∠ BAC is the circumference angle of arc BC, and ∠ BOC is the center angle of arc BC,
So, BOC = 2 BAC;
It is known that ∠ BAC = 80 °, (any internal angle of a triangle is less than 180 °, so the angle a = 180 ° in the question is wrong, here it is changed to angle a = 80 °)
It can be concluded that: BOC = 160 °

A total of 4800 chickens were raised in the farm, and the number of hens was 300 more than 1.5 times that of cocks. How many cocks and hens were raised respectively?

Suppose x cocks are raised, then (4800-x) hens are raised. From the equation, we get x × 1.5 + 300 = 4800-x, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2.5x = 4500, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 18004800-x, = 4800-1800, = 3000

Given vector a = (√ 3, - 1), B = (1 / 2, √ 3 / 2), let vector M = a + (T ^ 2-3) B, vector n = - Ka + TB, if vector m is perpendicular to vector n, try to find
The minimum value of (K + T ^ 2) / T
Requirements, detailed process, thank you

|A | = 2, | B | = 1, ab = 0, so a ^ 2 = | a | ^ 2 = 4, B ^ 2 = | B | ^ 2 = 1m n vertical Mn = - Ka ^ 2 + tab-k (T ^ 2-3) AB + T (T ^ 2-3) B ^ 2 = 0, so - 4K + T (T ^ 2-3) = 0, k = t (T ^ 2-3) / 4, so (K + T ^ 2) / T = [t (T ^ 2-3) / 4 + T ^ 2] / T = T ^ 2 / 4 + T-3 / 4 = (T + 2) ^ 2-7 / 4, so the minimum value is - 7 / 4

In the triangle ABC, ab = M & # 178; + 1, BC = 2m, AC = M & # 178; - 1, where m is an integer greater than 1, find the size of ∠ ACB

BC²+AC²=(2m)²+(m²-1)²=4m²+(m²)²-2m²+1=(m²+1)²=AB²
A triangle is a right triangle
∠ACB=90°

3a^2x^3/(1/3ax)*(-4a^5x^3)/(6a^2x^5)

3a^2x^3/(1/3ax)*(-4a^5x^3)/(6a^2x^5)
=9ax^2*(-2a^3/3x^2)
=-6a^4

P is a point on the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a > b > 0), and F is its focus. It is proved that the circle with PF as diameter is tangent to the circle with major axis as diameter

Let e be the other focus, the midpoint of PF is a, because o is the midpoint of the long axis, so OA = 1 / 2PE. According to the principle that the sum of the two sides of the triangle is greater than the third side, the distance between any point B and O on the circle is less than or equal to OA + AB, that is, less than or equal to 1 / 2PE + 1 / 2pF = a, and only when o, a, B are on a straight line, OB = a, that is, etc

It is known that, as shown in the figure, in △ ABC, ∠ BAC = 90 °, ab = AC, be bisects ∠ ABC, intersects AC with D, CE ⊥ be, and proves: CE = 1 / 2bd

Certification:
Extend CE, Ba to F
So △ BCE ≌ △ BFE (ASA),
∴CE=FE,∴CF=2CE
∵∠ADB=∠=EDC,
∵ the remainder of an equal angle is equal, so ∠ abd = ∠ ACF
Therefore, BD = CF = 2ce
∴CE=1/2BD

Assuming that a and B are shaping variables, it is necessary to rewrite the mathematical expression 1 / AB into C language expression