If the height of a cuboid is reduced by 2 cm, it becomes a cube. At this time, the surface area is reduced by 56 square cm What is the volume of the original cuboid Write out the equation and be more specific

If the height of a cuboid is reduced by 2 cm, it becomes a cube. At this time, the surface area is reduced by 56 square cm What is the volume of the original cuboid Write out the equation and be more specific

Let the original rectangle be x cm wide
X times 2 times 4 = 56
8x=56
x=7
7 times 7 times (7 + 2) = 49 times 9 = 441 (CC)
A: the original cuboid volume is 441 cubic centimeters

What is the ratio of 35 tons to 400 kg______ ．

35 tons: 400 kg, = 600 kg: 400 kg, = 600 △ 400, = 1.5

The ratio is 1,0.25:4.52,3 / 4 hours, 3400 cm: 0.8 m 4,2 tons, 450 kg: 125 kg

1, 0.25：4.5 =1/4÷9/2=1/18
2, 45 minutes: 3 / 4 hours = 45 minutes: 45 minutes = = 45 △ 45 = 1
3, 400cm: 0.8m = 400cm: 80cm = 400 △ 80 = 5
4, 2 tons 450 kg: 125 kg = 2450 kg: 125 kg = 2450 △ 125 = 19.6

12.56-5.1 * 1.8 should be calculated simply

How to calculate 60 points with 6,7,8,9,10

1 + 2-3 + 4-5 + 6-7 + 8-9 + 10-11 +. + 1992-1993 + 1994

=(1+2)+(4-3)+(6-5)+(8-7)+(10-9)-11+.+1992-(1994-1993)=999

1+2-3+4-5+6-7+8-9+10-11+.+1992-1993+1994=?
Why?

Hello, sx0311
1＋2－3＋4－5＋6－7＋8－9＋10－11＋.＋1992－1993＋1994
＝（1＋2）＋（4－3）＋（6－5）＋（8－7）＋（10－9）＋（12－11）＋.＋（1992－1991）＋（1994－1993）
＝3＋1×（1994－2）÷2
＝3＋996
＝999

1. A number of 2, 3, 4, 5, 6, 7, 8, 9 multiplied by 7 multiplied by 15873. What rule do you find?

The rule is very simple, 7 times 15873 is 111111, so it becomes this arrangement

The answer to the synchronous exercise book of the Yangtze River exercise book of the people's education press in the second semester of the seventh grade of mathematics is from Hubei Province
Not much, just the answer of 5.1 intersection line 3

B 2. D 3. C 4. A 5. AD and BC AC internal error ad BC EF in the same side AB EF BC in the same place 6. Slightly 7. (4) (6) 8. (3) 9

How to do the fourth question on page 41 of the first volume of the sixth grade mathematics exercise book of Zhejiang People's education press
A barrel of oil weighs half a kilogram. If one eighth of a kilogram is used, what percentage is used? What percentage is left?

1 / 8 △ 1 / 2 × 100%
=0.25 × 100%
=25 percent
(it's used for this)
One hundred percent - 25 percent = 75 percent
Promise right, because we've done it!