Solution equation: 40 + 25% x = 60

Solution equation: 40 + 25% x = 60

40+25%X=60
25%x=60-40
25%x=20
x=20÷25%
x=80

1.25x + x = 360 divided by four column equation

1.25x+x=360÷4
2.25x=90
x=40

Front view, survey view and top view are all isosceles right triangles of congruence. What kind of figure is it

It is a stereogram of three isosceles right triangles with right angle vertex and right angle edge glued together

How can the parabola y = 3x ^ 2-2x be obtained from the translation of the parabola y = 3x ^ 2?

∵y=3x²-2x
=3(x²-2x/3)
=3(x²-2x/3+1/9-1/9)
=3(x-1/3)²-1/3
The parabola y = 3x & # 178; - 2x can be shifted (1 / 3) units to the right by the parabola y = 3x & # 178,
And then down translation (1 / 3) units

How many tons is a cubic meter?

One is volume unit and the other is weight unit. How to convert? To calculate, we must multiply the density of matter
For example, if the density of water is 1000 × 10 ~ (- 179), kg / M ~ (- 179), then one cubic meter of water is equal to one ton

The relation between a monomial divided by a monomial and a monomial multiplied by a monomial
The relation between dividing a polynomial by a monomial and multiplying a polynomial by a monomial

A monomial divided by a monomial is a monomial multiplied by the reciprocal of that monomial
Similarly, a polynomial divided by a monomial is a polynomial multiplied by the reciprocal of the monomial

It is known that the coordinates of the vertex of the parabola are (0,0), and through (2,2), (- 2,2), the analytic expression of the quadratic function is obtained

The vertex coordinates of the parabola are (0,0) and pass through (2,2), (- 2,2) points above the x-axis, which are symmetric about the y-axis. It is shown that the opening of the parabola is upward and symmetric about the y-axis. Let the equation be y = ax & sup2; + BX + C, substitute (0,0) into C = 0, the equation is y = ax & sup2; + BX, and then substitute (2,2), (- 2,2) into 2 = 4A + 2B, 2 = 4A -

The change of matter and energy in light reaction and dark reaction is as follows

Photo reaction: Energy: the photolysis of water converts light energy into ATP active chemical energy
Substance: H2O = O2 + {h} (reduced hydrogen)
Dark reaction: Energy: ATP active chemical energy is converted into stable chemical energy in (CH2O) organic matter
Substance: CO2 + five carbon compounds = 2 three carbon compounds
Tricarbon compound + {h} (reduced hydrogen) = (CH2O)

1 ^ 2 + 3 ^ 2 + 5 ^ 2 + Λ + 97 ^ 2 + 99 ^ 2 =? (simplified calculation process)

Let me give you a formula, first 1 ^ 2 + 2 ^ 2 + 3 ^ 2 + 4 ^ 2 + +(n-1) ^ 2 + n ^ 2 = n (n + 1) (2n + 1) / 6 first calculate 1 ^ 2 + 2 ^ 2 + 3 ^ 2 + +100 ^ 2 = (100 × 101 × 201) / 6 = 338350 (formula 1), then calculate 1 ^ 2 + 2 ^ 2 + 3 ^ 2 + +50 ^ 2 = (50 × 51 × 101) / 6 = 42925 can get 2 ^ 2 + 4 ^ 2 + 6 ^ 2 + +100^2=4...

It is known that the line y = k [x + 2] [k > 0] intersects the parabola C: y2 = 8x at two points a and B, and F is the focus of the parabola C. If FA = 2 FB, the linear equation is solved

According to the definition, the Quasilinear equation of parabola C: y2 = 8x is y = - 2
Let the coordinates of a and B be (x1, Y1), (X2, Y2) respectively, then X1 - (- 2) = 2 [X2 - (- 2)]
x1=2x2+2
The intersection of y = K (x + 2) (k > 0) and x-axis is (- 2,0) on the parabola
By substituting the line y2 = 8x, the solution of the equation can be obtained as the value of intersection a and B: y ^ 2 = 8x = [K (x + 2)] ^ 2
Transfer: K ^ 2x ^ 2 + (4K ^ 2-8) x + 4K ^ 2 = 0
Then: X1 * x2 = 4 substitute X1 = 2x2 + 2 to get: 2x1 (x1 + 1) - 4 = 0
X1^2+X1-2=0
X1 = - 2 or 1
So X1 = 1, X2 = 4, K ^ 2 = 8 / 9
k=2√2/3