How to solve equation 5 (2x-1) = (1-2x) (x + 3)

How to solve equation 5 (2x-1) = (1-2x) (x + 3)

Reduce to 2x + 15x-8 = 0 and then change to (x + 8) (2x-1) = 0, so x = - 8 or 1 / 2

How to solve 4x 5x 3Y = 156?

Is x a multiplier or an unknown

9 * 101 * 9.9 calculated by simple method

(10-0.1)(10+0.1)(10-0.9)
=(100-0.01)9.9
=990-0.099
=989.901

What is the position relationship between the circle with the diameter of the focus chord of the parabola (the line segment obtained by cutting the parabola through the straight line of the focus) and the collimator of the parabola?

Tangency

Cut a cylinder 10 cm high into two parts along the diameter of its bottom, and increase its surface area by 40 square centimeters?

Surface area increased by 2 rectangles, area = 2 × bottom diameter × height = 2 × bottom diameter × 10 = 40 square centimeter
Diameter of bottom surface = 40 (2 × 10) = 2cm
Bottom radius = 1 cm
Cylinder volume = 3.14 × 1 × 1 × 10 = 31.4 cm3

The long of 44 times 56 / 57 will not be greater than the integer ()

The number of 44 times 56 / 57 will not be greater than the whole number (√)

Given the function f (x0 = (2-A) (x-1) - 2inx, G (x) = e ^ x-x + 1 (a is a constant, e is the base of logarithm of natural number, e is about 2.71828), (1) when a = 1,
Find the monotone interval of F (x); (2) if the function f (x) has no zero on the interval ((0,1 / 2), find the value range of a; (3) if any given x0 belongs to (0,1], there are two different X1 (I = 1,2) on (0, e) such that f (x1) = g (x0) holds, find the value range of A

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It is known that under the standard condition, the density of oxygen is 1.429g/l, the density of air is 1.293g/l, and the volume fraction of oxygen in air is 21%______ ．

Let the volume of air be 1L, because the volume fraction of oxygen in air is 21%, so the volume of oxygen is 0.21l, the mass of air = 1L × 1.293g/l = 1.293g, the mass of oxygen = 0.21l × 1.429g/l = 0.3g, so the mass fraction of oxygen in air = 0.3g1.293g × 100% = 23.2%

For any two natural numbers a and B, a new operation "*": a * b = AB + A / B, 75 * 5 =?, 14 * 2 =?, is defined?
emergency

75*5
=75×5+75/5
= 390
14*2
=14×2+14/2
=28+7
=35

Practical problems of calculating volume in sixth grade mathematics
The volume area statistics ratio application question all 10 questions
The volume area statistics ratio application question each 10 questions

It's very easy to calculate the volume of sixth grade mathematics