Given x ^ 2 + 3x = 0, find the value of the algebraic formula x (x + 1) (x + 2) (x + 3) - 8

Given x ^ 2 + 3x = 0, find the value of the algebraic formula x (x + 1) (x + 2) (x + 3) - 8

X ^ 2 + 3x = 0 shows x = 0 or x = - 3
When x = 0
x(x+1)(x+2)(x+3)-8=-8
When x = - 3
x(x+1)(x+2)(x+3)-8=-3（-3+1）（-3+2）（-3+3)-8=-8
In conclusion, it is known that the value of the algebraic formula x (x + 1) (x + 2) (x + 3) - 8 is - 8 when x ^ 2 + 3x = 0

If the value of the algebraic expression 3x-1 is between - 1 and 2, the integer that x can take has an urgent process

-1

0.88 × 0.125

0.88×0.125
=(0.8+0.08)×0.125
=0.8×0.125+0.08×0.125
=0.1+0.01
=0.11

What to do when a number is odd root and even root?
（x³-3x²+2x）（x-2）（1-x²）（x³-1）≤0
After simplification: X (X-2) &# 178; (x-1) &# 178; (x + 1) (X & # 179; - 1) ≥ 0
1 is both odd root and even root. What about the pinprick method?
When odd wear and even return, is it to wear or return?

This simplification is not the most simple, because there is a high-order term of X, we need to reduce x ^ 3 - 1 to (x-1) (x ^ 2 + X + 1), and then organize and merge it, and then use the root piercing method

As shown in the figure, in square ABCD, e is the trisection point of AD, AE = 13ad, G is the point on DC, and DG: GC = 2:7, then is be perpendicular to eg? Please state your reasons

It is proved that: let the side length of square ABCD be 9x, ∵ e be the trisection point of AD, and AE = 13ad, ∵ AE = 3x, ∵ DG: GC = 2:7, ∵ DG = 29 × 9x = 2x, CG = 7x, in RT △ AEB, ∵ AB = 9x, AE = 3x, ∵ be2 = AB2 + AE2 = (9x) 2 + (3x) 2 = 90x2; similarly, EG2 = ED2 + DG2 =

The roof area of a classroom is about 100m, and the atmospheric pressure is the fifth power of 10 PA
What is the atmospheric pressure on the upper surface of the roof? How many 20t trucks park on the roof? Why is the roof not crushed by such a high atmospheric pressure? (G is 10N / kg)

F=PS
=10^5*100
=10^7N
It's not crushed because the lower surface of the roof also has the same upward atmospheric pressure, which produces the same atmospheric pressure

A, B, C and D donated money to the hope project for four people. It is known that the average donation of a, B and C is 38 and 1 / 3 yuan, and that of B, C and D is 51 and 2 / 3 yuan. The donation of B and C is 17 / 45 of that of the four people. How many yuan do the four people donate in total?

(38 1 / 3 + 51 2 / 3) / (1 + 45 17 / 3)
=270/(62/45)
=97 yuan

How to calculate the perimeter and area of a square and rectangle?

Square circumference = side length * 4
Area = square of side length
Rectangle circumference = (L + W) * 2
Area = length * width

How to calculate the eighth power of 8 and the twelfth power of X (- 1 / 4)
Simple, thank you

8 to the eighth power X (- 1 / 4) to the twelfth power
=The 24th power of X (1 / 2)
=The 24th power of (2x1 / 2)
=The 24th power of 1
=1

It took 25 seconds for a train to pass through a 386 meter railway bridge, followed by 17 seconds for it to pass through a 236 meter long tunnel. How long is the train?

First, the actual length of the bridge (tunnel) is the length of the vehicle plus the length of the bridge (tunnel)
Speed: (386-236) / (25-17) = 75 / 4 (M / s)
Further calculation of vehicle length: 75 / 4 × 25-386 = 1875 / 4-386 = 331 / 4 (m)