Simple algorithm for finding (- 2.5) + (+ 8.1) + (- 7.4 + (+ 11.3) + (- 12) + (+ 56)

Simple algorithm for finding (- 2.5) + (+ 8.1) + (- 7.4 + (+ 11.3) + (- 12) + (+ 56)

fifty-three point five

3.6×2.7+18×0.56-1.8×10%÷l0%

3.6×2.7+18×0.56-1.8×10%÷l0%，=（1.8×2）×2.7+1.8×5.6-1.8×（10%÷l0%），=1.8×（2×2.7）+1.8×5.6-1.8，=1.8×（5.4+5.6-1），=1.8×10，=18．

On the exercises of a dream of Red Mansions
More than once in the Grand View Garden, an ordinary peasant woman who is often teased by everyone is ()
The traditional idea that men are superior to women in a dream of Red Mansions challenges ()

Granny Liu (three times in Grand View Garden, the first two times to ask for some money to spend the day, the second time to visit and thank you, and the last time to take sister Qiao away)
Jia Baoyu and Lin Daiyu

1-1 / 2-1 / 4-1 / 8-1 / 16-1 / 32-1 / 64-1 / 128 =? There should be a formula

=1/2-1/4-1/8-1/16-1/32-1/64-1/128
=1/4-1/8-1/16-1/32-1/64-1/128
=1/8-1/16-1/32-1/64-1/128
=1/16-1/32-1/64-1/128
=1/32-1/64-1/128
=1/64-1/128
=1/128

How to find the range of y = lgx + LG (x-1)
How to define the range of y = lgx + LG (x-1) in detail

The domain is x > 1
Let g (x) = x (x-1) = (x-1 / 2) ^ 2-1 / 4
x> When gmin = g (0) = 0, Gmax = + ∞, the range of G (x) is positive
Therefore, the range of y = lgx + LG (x-1) = LG g (x) is r

Put eight 6cm long squares together to form a big square. What is the volume of the surface area of the big square

Put eight 6cm long squares together to form a big square. What is the volume of the surface area of the big square
The length of the cube is 6 × 2 = 12 cm
Surface area 12 × 12 × 6 = 864 square centimeter
Volume 12 × 12 × 12 = 1728 cm3

How do five sixes equal 24

6-6+6+6+6+6

It is known that all items of the sequence {an} are positive numbers, the first n terms and Sn satisfy Sn = 16 (an + 1) (an + 2), and A2, A4 and A9 are equal proportion sequences. (1) find the general formula of the sequence {an}; (2) let BN = (- 1) n + 1anan + 1, tn be the sum of the first n terms of the sequence {BN}, find T2N

(1) ∵ for any n ∈ n *, there is Sn = 16 (an + 1) (an + 2) ① when n ≥ 2, there is Sn − 1 = 16 (an − 1 + 1) (an − 1 + 2) ② when (an + an-1) (an-an-1-3) = 0, and every term of {an} is a positive number, so an-an-1 = 3

A square with an area of 64 square centimeters and a circumference of ()
A. 8 cm B. 16 cm C. 32 cm

The area of a square is 64 square centimeters, because 64 is the square of 8, so the side length of the square is 8 centimeters, perimeter: 8 × 4 = 32 (CM); answer: its perimeter is 32 centimeters

1.27,6 ,23,6,19,6,15,6,( ) ( )
1.27,6 ,23,6,19,6,15,6,( ) ( )

27,6 ,23,6,19,6,15,6,(11) (6)
It should be separated by a number, minus 4, with 6 in the middle