There is a rectangular sheet of iron 40 cm in length and 30 cm in width. Cut out an equal small square at its four corners to make a cuboid uncovered sheet iron box 5 cm in depth (the thickness of welding joint is not included). What is the volume of the box?

40-5 × 2 = 30 (CM) 30-5 × 2 = 20 (CM) 30 × 20 × 5 = 3000 (cm3) a: the volume of the tin box is 3000 cubic centimeters

A rectangular iron sheet with 40.30 in length and 40.30 in width 'cut a square with 5 cm in side length from each corner' and make a rectangular iron box with 5 cm in depth without cover 'to calculate the volume of the iron box
(the thickness of iron sheet is not included) hurry! Help me solve it. Give me points~~

The cut length is 40 - (5 * 2) = 30cm
The width is 30 - (5 * 2) = 20cm
The height is 5cm
So: the volume of iron box is 30 * 20 * 5 = 3000cm ^ 3

One in two plus 19 in 40 divided by 19 in 20 minus 5 in 8
There are no brackets

One in two plus 19 in 40 divided by 19 in 20 minus 5 in 8
=1/2+19/40*20/19-5/8
=1/2+1/2-5/8
=3/8

2. The ratio of two similar quadrilateral is 1:3, and the sum of perimeter is 88cm, and the difference of area between two quadrilateral is 192cm ^ 2

Similarity ratio = perimeter ratio
Square of similarity ratio = area ratio
The girth ratio is 1:3 = 22:66, and the girth is 22cm and 66cm respectively
Area ratio = 1:9 = (192 / 8): 9 * (192 / 8) = 24:216, the area is 24cm ^ 2 and 216cm ^ 2 respectively

The general formula of 0,3,8,15,24 ···

We can add 1 to every number, that is, 1,4,9,16,25. It is not difficult to see the square of the general term n of the new sequence, and the general term of the original sequence is the square of n minus 1

The area of a trapezoid is 1.2 square meters, the height is 0.6 meters, and the upper bottom is 1.8 meters. What is the lower bottom of this trapezoid

The area of a trapezoid is 1.2 square meters, the height is 0.6 meters, and the upper bottom is 1.8 meters. What is the lower bottom of this trapezoid
Bottom = 1.2 × 2 △ 0.6-1.8
=4-1.8
=2 m;
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90.2-10% x = 80.2

90.2-10%x=80.2
90.2-0.1x=80.2
0.1x=90.2-80.2
0.1x=10
x=100

If the price of glass is 2 yuan per square decimeter, how much will it cost to buy this glass?

A: it costs 9660 yuan to buy this glass

At - 49, - 48, - 47 The sum of the first 99 consecutive integers in a string of numbers is?
How can I calculate = 49.5? It seems wrong

It's 0
The first 50 numbers are - 49 to 0, and the last 49 numbers are 1 to 49. They cancel each other and the result is 0

In isosceles △ ABC, the median line BD on one waist AC divides the circumference of △ ABC into two parts, 12cm and 15cm, and calculates the length of each side of △ ABC

As shown in the figure, ∵ BD is the middle line, ∵ 12cm is the sum of waist length and half of waist length, waist length = 12 △ 1.5 = 8cm, bottom edge = 15-8 × 12 = 11cm, three sides of triangle are 8cm, 8cm and 11cm respectively, which can form triangle, 15cm is the sum of waist length and half of waist length, waist length = 15 △ 1.5 = 10cm, bottom edge = 12-10 × 12 = 7cm, three sides of triangle are 10cm, 10cm and 7cm respectively, which can form triangle The length of each side of △ ABC is 8cm, 8cm, 11cm or 10cm, 10cm, 7cm respectively

There is a rectangular sheet of iron 40 cm in length and 30 cm in width. Cut out an equal small square at its four corners to make a cuboid uncovered sheet iron box 5 cm in depth (the thickness of welding joint is not included). What is the volume of the box?