How many square centimetres does the surface area of the cuboid decrease after the cuboid is lined up What's the square percentage? Yes, there will be an extra reward

How many square centimetres does the surface area of the cuboid decrease after the cuboid is lined up What's the square percentage? Yes, there will be an extra reward

Original surface area = 5 × 4 × 4 × 6 = 480 (square centimeter)
Surface area of cuboid = 4 × 5 × 4 × 4 + 4 × 4 × 2 = 352 (square centimeter)
Reduced surface area = 480-352 = 128 (cm2)

A rectangle is 20 cm long, 15 cm wide and 6 cm thick. At least how many such blocks can be used to build a larger cube?

Solid or hollow? The answer will be different

A rectangular block is 20cm in length, 15cm in width and 6cm in thickness. At least how many such blocks are needed to make a larger cube?

120

Use rectangular wood blocks 20 cm long, 15 cm wide and 6 cm high to pile up a cube, which requires at least 10 minutes______ A piece of wood like this

20 = 2 × 2 × 5, 15 = 3 × 5, 6 = 2 × 3, the least common multiple of 20, 15 and 6 is 5 × 2 × 3 × 2 = 60, the edge length of the stacked cube is 60 cm, 60 ／ 20 = 3 (blocks), 60 ／ 15 = 4 (blocks), 60 ／ 6 = 10 (blocks), 3 × 4 × 10 = 120 (blocks), a: at least 120 such blocks are needed

There are three identical cuboid building blocks, which are 8cm in length, 4cm in width and 2cm in height. Now, what's the maximum value of building a large cube
Urgent! If you know, thank you

Is it impossible to build a cube? Is it still allowed to be cut? Or is the problem hanging in the air, as long as the outside is closed? Or would you please tell me the topic carefully

Put 48 balls in a box, and each box contains the same amount. How many ways are there? How many boxes do you need for each packing method? What if there were 37 balls?

(1) The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48; 48 = 1 × 48; 48 in a box, 1 box; or 1 box, 48 boxes; 48 = 2 × 24, 24 in a box, 2 boxes; or 2 in a box, 24 boxes; 48 = 3 × 16, 16 in a box, 3 boxes; or 3 in a box, 16 boxes; 48 = 4 × 12, 12 in a box, 4 boxes; or 4 in a box, 12 boxes; 48 = 6 × 8 A: there are 10 kinds of packing methods: ① 48 in a box, 1 in a box; ② 1 in a box, 48 in a box; ③ 24 in a box, 2 in a box; ④ 2 in a box, 24 in a box; ⑤ 3 in a box, 16 in a box; ⑥ 16 in a box, 3 in a box; ⑦ 12 in a box, 4 in a box; ⑤ 4 in a box, 12 in a box, 6 in a box, 8 in a box (2) the factors of 37 are: 1, 37, because 37 = 1 × 37, so a box of 37, pack 1 box; or each box, pack 37 boxes. Answer: there are two kinds of packing methods: ① one box of 37, pack 1 box; ② one box of 37, pack 37 boxes

There are several ways to fill in the proper number in ()
1 1 1
------ + ------ + ------ = 1
（ ） （ ） （ ）
I'm talking about fractions, () 1 + () 1 + () 1 = 1

1 1 1
------ + ------ + ------ = 1
(3) （3 ） （3 ）

There are 15 blocks in each big box and 12 blocks in each small box. The total number of blocks is 129, and the total number of boxes is less than 10

Set X large boxes and Y small boxes
be
15x+12y=129
Let x + y = 10 = > x = 10-y
15(10-y)+12y=129
21=3y
y=7
be
x=3

Xiaohua plays with building blocks. The number of these building blocks is more than 50 and less than 70. Xiaohua has one more block for every seven piles. How many of these building blocks are there for every nine piles or one more?

7×9+1
=63+1
=64 (pieces)

There are some building blocks that are more than 50 or less than 70. They are stacked every seven, one more, one more for every nine______ Block

7 and 9 are coprime numbers, and their least common multiple is their product: 7 × 9 = 63, 63 + 1 = 64, 50 < 64 < 70, so there are 64 blocks in these blocks; so the answer is: 64