Solution equation: (19-2x + 3) △ 0.25 = 16 . I'm in Grade 5 next semester. Please solve the problem in detail. I can understand it . Please calculate this problem skillfully

Solution equation: (19-2x + 3) △ 0.25 = 16 . I'm in Grade 5 next semester. Please solve the problem in detail. I can understand it . Please calculate this problem skillfully

(19-2x+3)÷0.25=16
19-2x+3=16×0.25
22-2x=4
22-4=2x
18=2x
x=9

3 / 4x-1 / 2x = 25 solve the equation

(3/4-1/2)X=25
1/4X=25
X=25÷1/4
X=100

How to solve the equation x-0.25 = 0.25 + 0.2x

0.8x=0.5
x=5/8

How many cubic decimeters is 0.5 cubic meters? How many cubic decimeters is 1.13 cubic meters

0.5 m3 = 500 cubic decimeter
1.13 cubic meters = 1130 cubic decimeters

The side view of the front view is isosceles trapezoid, and the top view is circular. What kind of solid figure is this?
The top view has only one circle
The top view is not a circle, only a circle
It should not be a round table. I suspect the title is wrong

Round table
(small circle above, big circle below)
Solid reference lamp shade

The parabola y = x & # 178; + 2x-3 can be translated 3 unit lengths to the right, and then 7 unit lengths to the up to form a parabola

y=x^2-4x+7

How many cubic meters of natural gas is the heat energy of a kilogram of coal·······

General coal combustion value is 5500 kcal / kg
Combustion value of natural gas is 9000 kcal / m3 (under standard state)
One kilogram of coal is 5500 / 9000 = 0.61 cubic meters of natural gas (under standard state)
Coal combustion value and natural gas combustion value sometimes change, which is basically the above value

It is known that the polynomial x2-kx + 1 is a complete square expression, then the analytic expression of the inverse scale function y = k-1x is ()
A. Y = 1xb. Y = - 3xc. Y = 1x or y = - 3XD. Y = 2x or y = - 2x

∵ the polynomial x2-kx + 1 is a complete square expression, k = ± 2. Substituting k = ± 2 into the analytic expression of the inverse scale function y = k-1x, we can get y = 1x or y = - 3x, so we choose C

The shape of the opening direction of a parabola is the same as y = 0.5x2, the vertex ordinate is - 1, and the parabola passes through the point (1,1). Find the function of the parabola

Let the analytic expression of parabola be
y=0.5(x-h)²-1
Because the parabola passes through point (1,1)
therefore
1=0.5(1-h)²-1
(1-h)²=4
H = 3 or - 1
So the analytical formula of parabola is y = 0.5 (x-3) & sup2; - 1 or y = 0.5 (x + 1) & sup2; - 1

What is the definition of junior high school physics analogy? Please give an example

Analogy: in order to express the physical problems clearly, we often use concrete, tangible and familiar things to compare those abstract, intangible and strange things. Through analogy, we can make people have a direct, specific and image understanding of the things to be prompted, and find out similar