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Solve the equation: 2x + 1 of 2x-1 plus 1-2x of 1 + 2x = 1-4x ^ 2 of 4
（2x-1)/(2x+1)+(1+2x)/(1-2x)=4/(1-4x²)
Namely
（2x-1)/(1+2x)+(1+2x)/(1-2x)=4/【(1+2x)(1-2x)】
Multiply both sides by (1 + 2x) (1-2x) to get:
（2x-1)(1-2x)+(1+2x)(1+2x)=4
2x-4x²-1+2x+1+4x+4x²=4
8x=4
x=1/2
When x = 1 / 2, (1 + 2x) (1-2x) = 0
So the original equation has no solution
If the image of quadratic function y = mx2-3x + 2m-m2 passes through the origin, then the value of M is ()
A. 1b. 0C. 2D. 0 or 2
Substituting the point (0, 0) into y = mx2-3x + 2m-m2, 2m-m2 = 0, M = 0 or 2, m ≠ 0, M = 2, so C
If the square ABCD is known, what is the eccentricity of the ellipse with ab as the focus and passing through C and D
Let the length of a square be m, then
2c=m,c=m/2
2a=√2m+m,a=(√2+1)m/2
e=c/a=1/(√2+1)=√2-1
Calculation, ① 31 / 50 + 4 / 5-9 / 20, ② 3 / 4-5 / 12 + 2 / 3, ③ 1-1 / 6-1 / 3-1 / 2, ④ 3 / 8 + (7 / 12 + 5 / 6)
emergency
2, 9 / 12-5 / 12 + 8 / 12 = 1. 4, 9 / 24 + 14 / 24 + 20 / 24 = 43 / 203, 6 / 6-1 / 6-2 / 6-3 / 6 = 0
It is known that one root of the equation x2-6x + p2-2p + 5 = 0 about X is 2. Find the other root of the equation and the value of P
According to the meaning of the question, we can get X1 + x2 = 6, x1x2 = p2-2p + 5, and we know that one root of the equation x2-6x + p2-2p + 5 = 0 is 2, the solution can get x2 = 4, and there is x1x2 = p2-2p + 5 = 8, the solution can get P = - 1, or P = 3; answer: the other root of the equation is 4, and the value of P is - 1 or 3
Write the elliptic standard equation suitable for the condition: a = 4, C = √ 15, the focus is on the y-axis
From the relationship between focal length and long short half axis: B ^ 2 = a ^ 2-C ^ 2
b²=4²-（√5）²
=16-15
=1
So the elliptic standard equation is X & sup2 / 1 + Y & sup2 / 16 = 1
1,5 / 4,23 / 12,55 / 24,97 / 40
An =? / 2n × (n-1) (n ≥ 2)
1（n=1)
My ability is limited, help here
0.5 × 1 / 3 x plus 0.7 × [88 minus x] × 1 / 4 = 15. Is there any skill in solving such an equation
If we multiply both sides by 12 at the same time, we can get:
2x+2.1*(88-x)=180
0.1x=4.8
x=48
() divided by () is equal to () than () is equal to three fourths is equal to several parts is equal to ()
Are the numbers different?
16 divided by 12 equals 8 to 6 equals three quarters equals 0.75
The values of A1, A2 and A3 in Excel are 9, Monday and X5 respectively. The formulas that can be calculated are () a, = A1 ^ 2 B, = A2 + a3 C, = A2 + 1 D, = a1 + 1 e, = a1 + A2
In Excel, set the values of A1, A2 and A3 cells as 9, Monday and X5 respectively, then the following formula can be calculated is ()
A、=A1^2 B、=A2+A3 C、=A2+1 D、=A1+1 E、=A1+A2
A、=A1^2
D、=A1+1
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