How much is sine 10 degree in trigonometric function

How much is sine 10 degree in trigonometric function

zero point one seven three six

Solving quadratic inequality of one variable - 2x & # 178; + 6x-5 < 0

b²-4ac=36-40

Mischievous in the calculation, a number divided by 4 as multiplied by 4, the result is eight out of nine, the correct answer is how much?

The correct answer is (1 out of 18)
8 / 9 / 4 / 4
=2 / 9 / 4
=1 out of 18
If you have any questions, please ask,

Only (X-2) ^ 2 + (y + 3) ^ 2 = 0 has been used to calculate the value of XY!
Thank you for the process

Method 1
The square of two numbers is equal to 0, indicating that both numbers are 0, that is, (X-2) ^ 2 = 0, (y + 3) ^ 2 = 0, that is, X-2 = 0, y + 3 = 0, x = 2, y = - 3, X * y = 2 * - 3 = - 6
Method 2
The equation satisfies the equation of a circle, and the center of the circle is (x, y) = (2, - 3), that is, x = 2, y = - 3, X * y = 2 * - 3 = - 6

In a subtraction formula, the sum of the subtracted, the subtracted and the difference is one and two fifths, and the subtracted is ()

The subtracted is: 1 and 2 / 5 △ 2 = 7 / 10

Known XY

From XY < 0, x + y < 0,
We know that x < 0, y < 0
From | x | = 3, | x = - 3,
Y & # 178; = 1, y = ± 1, take y = - 1,
∴|x-4|+（y+3)²
=|-3-4|+（-1+3）²
=7+4
=11.

The school held tree planting activities on tree planting day. Three classes in grade six planted 180 trees
Six [1] class planted 1 / 3 of the total number of trees, the rest were planted by six [2] class and six [3] class according to the ratio of 2:3, how many trees were planted in each of the three classes
Please make a formula

180 times 1 / 3 = 60180-60 = 120, 2 + 3 = 5120 times 2 / 5 = 48120-48 = 72, [1] 60, [2] 48, [3] 72

Given a ^ 2-5a-1 = 0, then the value of the algebraic formula (a ^ 4 + A ^ 2 + 1) / A ^ 2 is

A ^ 2-5a-1 = 0 both sides of the equation divide by a:
a-5-1/a=0
a-1/a=5
(a-1/a)^2=5^2
a^2-2+1/a^2=25
a^2+1/a^2=27
(a^4+a^2+1)/a^2
=a^2+1+1/a^2
=a^2+1/a^2+1
=27+1
=28

Three exercise books plus one rubber are worth 2 yuan, two exercise books plus one rubber are worth 1 yuan and 4 jiao. How much is one exercise book worth

Three exercise books plus a rubber is worth 2 yuan, and two exercise books plus a rubber is worth 1 yuan and 4 jiao. The former has one more exercise book than the latter, that is to say, the price of an exercise book is 2 yuan minus 1 yuan and 4 jiao, and the price of an exercise book is 6 jiao

1. (2 / A + 3 / b) (4 / 1A ^ 2-6 / 1ab + 9 / 1b ^ 2) 2. (4a ^ 2-2 / 5B ^ 2)

1. (2 / A + 3 / b) (4 / 1A ^ 2-6 / 1ab + 9 / 1b ^ 2)
=(3a+2b)/6×(9a²-6ab+4b²)/36
=(3a+2b)(3a-2b)²/216
2. (5b ^ 2 of 4A ^ 2-2)
=(8a²-5b²)/2