22 degrees 25 minutes multiplied by 3 to calculate 96 degrees 37 minutes 42 seconds divided by 2 36 degrees 55 minutes + 32 degrees 15 minutes

22 degrees 25 minutes multiplied by 3 to calculate 96 degrees 37 minutes 42 seconds divided by 2 36 degrees 55 minutes + 32 degrees 15 minutes

22°25'×3 ÷
=66°75'
=67°15'
96°37'42''÷2
=96°36'102''÷2
=48°18'51''
36°55'+32°15'
=68°70'
=69°10

It is known that SiNx = 1 / 3,2 π

[sin(x/2)+cos(x/2)]²
=sin²(x/2)+2sin(x/2)cos(x/2)+cos²(x/2)
=1+sinx
=4/3
2π

37 times 27 equals 37 times () + 37 times () equals ()
The second volume of the third grade, Beijing Normal University Edition

20 7 999

Given TaNx = 2, tany = 1 / 3, then tan2 (x + y)=

The problem is as follows: the original formula = Tan (2x + 2Y) = (Tan 2x + Tan 2Y) / (1-tan 2x. Tan 2Y);
Where tan2x = Tan (x + x) = (TaNx + TaNx) / (1-tanx. TaNx) = - 4 / 3
tan2y=tan(y+y)=(tany+tany)/(1-tany .tany)= 3/4
Then the two of them are brought into the original formula, and the result is: - 7 / 24

A simple method of multiplying 25 by 48

25x48
=25x4x12
=100x12
=1200
Hope to help you

The equation of ellipse C is (x ^ 2) / 8 + (y ^ 2) / 4 = 1. If the line y = x + m intersects ellipse C at two different points a and B, and the midpoint m of line AB is on the circle x ^ 2 + y ^ 2 = 1, the value of M is obtained

(x^2)/8 +(Y^2)/4=1
(x^2)/8 +(x+m)^2/4=1
x^2+2(x+m)^2=8
3x^2+4mx+2m^2-8=0 16m^2-24^m^2+96>0 8m^2

Solve the equation. 3x + 6 = 18

3x=18－6=12.x=4

It is known that the two real roots of the equation x ^ 2 + ax + B = 0 plus 1 are the two real roots of the equation x ^ 2-A ^ 2x + AB = 0. Try to find the value or range of a and B

Let the two real roots of x ^ 2 + ax + B = 0 be x1, and X2 be obtained by Weida's theorem: X1 + x2 = - A - (1) x1x2 = B - (2) the two real roots of the equation x ^ 2-A ^ 2x + AB = 0 are (x1 + 1), (x2 + 1) X1 + 1 + x2 + 1 = a ^ 2 - (3) (x1 + 1) (x2 + 1) = ab - (4) from (1) (3) to - A + 2 = a ^ 2, and the solution is a = 1 or a = - 2. If a = 1, then: (...)

Simple calculation. 0.125 * 3.2 * 6.25
2.25*[9.6/（2.25*3.2）]

1、
simple form
=（0.125×8）×（0.4×2.5）×2.5
=1×1×2.5
=2.5
2、
simple form
=（2.25÷2.25）×（9.6÷3.2）
=1×3
=3

On the curve y = - x ^ 2 + 4 (x > 0), to the left of the point closest to the fixed point P (0,2) is
The coordinates of the nearest point are

Let that coordinate be (x, y). Because on the parabola, then the coordinate is (x, - x ^ 2 + 4), then the distance from the point to the fixed point is √ [(- x ^ 2 + 4-2) ^ 2 + (x-0) ^ 2] = √ (- x ^ 2 + 2) ^ 2 + x ^ 2) = √ (x ^ 4-4x ^ 2 + 4 + x ^ 2) = √ (x ^ 4-3x ^ 2 + 4) = √ [(x ^ 4-3x ^ 2 + 9 / 4) + 4-9 / 4] = √ [(x ^ 2-3 / 2) ^ 2 + 7 / 4] when x ^ 2-3 /