(4a-b Square) times (- 2b)

(4a-b Square) times (- 2b)

(4a-b Square) times (- 2b)
=-8ab+2b³

Dear friends, if you know | a-b-3 | + (B + 1) square + | C-1 | = 0, find the value of (- 3AB) × (a square c-6b square C)

He Xiaoyun,
∵|a－b－3|＋（b＋1）^2＋|c－1|＝0,
∴a－b－3＝0,b＋1＝0,c－1＝0
The solutions of the equations are as follows
a＝2,b＝－1,c＝1
（－3ab）×（a^2c－6b^2c）
＝〔－3×2×（－1）〕×〔2^2×1－6×（－1）^2×1〕
＝6×〔4－6〕
＝6×（－2）
＝－12

What's the final number of squares in math problem 2

Starting from the first power, the end numbers of 2 ^ n are 2,4,8,6,2,4,8,6,
It can be seen that every fourth power is a cycle. If the power number can be divided by 4 (the remainder is 0), the mantissa is 6
2011÷4=502.3
The remainder is 3, so it ends with 8

Prove that 2013x2014x2015x2016 + 1 is a square number

2013x2014x2015x2016 + 1 = 16469060287681 = 4058209x4058209, so it's Square

How many square meters are 8 meters wide, 4 meters long and 6 meters long?
How many square meters should I use to install the whole wallpaper? The roof doesn't fit.

Square is length multiplied by width by 24 square, cubic number = length, width and height multiplied
4 walls, 2 sides, 3.8 times 4 plus 2 sides, 3.8 times 6 = 76 square meters

A cone-shaped sand beach has a bottom area of 3.6 square meters and a height of 2 meters. How many meters thick can you lay the sand in a sand pit with a length of 4 meters and a width of 2 meters?

3.6 × 2 × 13 ^ (4 × 2) = 7.2 × 13 ^ 8 = 2.4 ^ 8 = 0.3 (m) a: how much 0.3 m thick can it be paved

For a rectangle, the length increases by 4 meters, the width decreases by 2 meters, and its area remains unchanged; the length decreases by 3 meters, the width increases by 6 meters, and the area increases by 76 square meters
How many meters is the original length and width of this rectangle?

Let this rectangle be x meters in length and Y meters in width
(x+4)(y-2)=xy
(x-3)(y+6)=xy
x-2y+4=0
2x-y-6=0
x=16/3
y=14/3
The rectangle was 16 / 3 meters long and 14 / 3 meters wide

There is a cone sand pile with a bottom area of 3.6 square meters. How thick can it be laid in a rectangular sand pit with a length of 4 meters and a width of 2 meters

1/3*3.6*2=4*2h
h=0.3

A rectangular tank full of water is 7.5m long, 4m wide and 2.826m deep. The radius of the water pipe of a pump is 5cm. When pumping, the water flow velocity is 2m per second. How long does it take to finish pumping
Please be sure to answer me today. Thank you first

7.5 * 4 * 2.826 = 84.78 (M3)
3.14 * 0.05 * 0.05 * 2 = 0.0157 (M3)
5400.0157

There is a pool with springs continuously gushing out at the bottom. To drain the full pool, it takes 5 hours to use 12 pumps and 7 hours to use 10 pumps. If it is to be drained within 2 hours, how many pumps are needed at least?

Suppose that the amount of full pool water at the beginning of pumping is x, the amount of spring water per hour is y, and the amount of pump water per hour is Z. if n pumps are needed to dry the full pool water in 2 hours, then x + 5Y = 5 × 12z, ① x + 7Y = 7 × 10z, ② x + 2Y ≤ 2nz, ③ from ① ② to obtain x = 35zy = 5Z, substitute ③ to obtain: 35z + 10z ≤ 2nz  n ≥ 2212, so the minimum integer value of n is 23 There are 23 water pumps