Simple calculation 36 * 35 / 34

Simple calculation 36 * 35 / 34

36*35/34
=36*（1-35/1）
=36-35/36
=36-1 and 35 / 1
=34 and 35 / 34

There are 98 students in the two classes of grade 6. One third of class 61 is equal to one fourth of class 62. How many students are there in class 61 and class 62

One third of class 61 is equal to one fourth of class 62
The ratio of the two classes is 1 / 4:1 / 3 = 3:4
Class 1 has 98x3 / (3 + 4) = 42
Class 2 98-42 = 56

How much is 1 / 2 plus 1 / 2009?
Bonus points!

1/2+1/2009=2009/4018+2/4018=2011/4018

Let the left and right focus of ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a 〉 B 〉 0) be F1, F2, and point P (a, b) satisfy PF2 = F1F2

If point F2 (C, 0) is set, then F1F2 = 2C
PF2=2c
（a-c）`2+b`2=4c`2
a`2=b`2+c`2
The centrifugation rate is C / a = [(√ 14) - 2] / 5

The circumference of a quadrilateral is equal to 28 cm. It is known that the first side is equal to a cm, the second side is 3 cm longer than the first side, and the third side is 1 cm shorter than the 23 of the second side. Try a to represent the length of the fourth side

The second side length is a + 3; the third side length is 23 (a + 3) - 1 = 23a + 1; so the fourth side length is 28-a - (a + 3) - (23a + 1) = 24-83a

If cos (Γ - α) = 8 / 17, α ∈ (Γ, 3 / 2 Γ), then Tan α=

It is known that cos (Γ - α) = 8 / 17
So cos α = - 8 / 17
And α∈ (Γ, 3 / 2 Γ)
So sin α = - √ (1 - (- 8 / 17) ^ 2) = - 15 / 17
So tan α = sin α / cos α = (- 15 / 17) / (- 8 / 17) = 15 / 8

Let a (m, - M-3), B (2, m-1), C (- 1,4), the slope of the line AC = 3 times the slope of the line BC, and find the value of the real number M

The slope of the straight line AC is [4 - (- M-3)] / (- 1-m) = (M + 7) / (- 1-m); the slope of the straight line BC is (m-1-4) / [2 - (- 1)] = (m-5) / 3. According to the meaning of the question, we know that (M + 7) / (- 1-m) = 3 * (m-5) / 3, and get m = 1 or 2

The inverse scale function y = (2m-1) x ^ (m ^ 2-2), when x > 0, y increases with the increase of X, M =?
a +/-1
Real numbers with b less than half
c -1
d 1

If D is selected, y decreases gradually with the increase of X, indicating that 2m-1 > 0, M > 1 / 2 is obtained, and it is an inverse proportion function, then m ^ 2-2

X is more than 8.4. How to set up the equation?

X-8.4=6

The concept of high school function
F (x), G (x), then the domain of F (x) + G (x) is the union of the domain of two functions
So what's the problem? Why is the answer [- 2,2]?
If the domain of function y = f (x) is [- 2,4], then the domain of function f (x) = f (x) + F (- x) is_______

F (x), G (x), then the domain of F (x) + G (x) is the intersection of the domain of two functions
If the domain of y = f (x) is [- 2,4], then the domain of y = f (- x) is [- 4, + 2], and the intersection with [- 2,4] is the answer