Fill a cube water tank with 8 decimeters long, and then pour all the water into the cuboid water tank with 80 square decimeters bottom area. What's the height of the water tank?

Fill a cube water tank with 8 decimeters long, and then pour all the water into the cuboid water tank with 80 square decimeters bottom area. What's the height of the water tank?

What is the volume of water
8 × 8 × 8 = 512 (cubic decimeter)
The water is high
512 △ 80 = 6.4 (decimeter)

There is a cube water tank, each side of which is 5DM long. If a full tank of water is poured into a rectangular tank, which is 8dm long and 25cm wide, how deep is the water?

25 cm = 2.5 decimeters, 5 × 5 × 5, = 25 × 5, = 125 (cubic decimeters); 125 ^ (8 × 2.5), = 125 ^ 20, = 6.25 (decimeters); answer: the water depth is 6.25 decimeters

Simple calculation of 45 ^ 2 + 55 ^ 2 + 2 * 45 * 55

45²+55²+2×45×55
=(45+55)²
=100²
=10000

There is a cube pool. The length of the measuring edge is 4 meters, and the depth of the pool is 2 meters. If the pool is pumped to another cuboid pool with a length of 5 meters and a width of 4 meters, there is no water

4*4*2=32
32/（5*4）=1.6

Simple calculation of 55 × 33 × 2

5*11*3*11*2=5*3*2*121=3630

Simple calculation of 99.99 * 5.5-55.55 * 9.9

99.99×5.5－55.55×9.9 ＝99.99×5.5－11.11×5×1.1×9 ＝99.99×5.5－﹙11.11×9﹚×﹙1.1×5﹚ ＝99.99×5.5－99.99×5.5 ＝99.99×﹙5.5－5.5﹚ ＝99.99×0 ＝0

Simple calculation of 0.55 * 9.9

0.55 times (10-0.1)
=0.55*10-0.55*0.1
=5.5-0.051
five point four four five

What is the formula for this calculation?
a^1+a^2+a^3+``````+a^n=?

The common ratio is a
According to the sum formula Sn = A1 (1-Q ^ n) / (1-Q) = A1 (1-A ^ n) / (1-A)
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The following formula is simple
12.5×8.2×8 0.23×1.4+0.23×8.6 0.125×（80+0.8）
64.4-11.2-38.8 0.4×0.16×2.5 1.63+19.9+0.37
6.3×99 1.15×99×1.15 5.6×101
Come on! OK, bonus points!

12.5×8.2×8=12.5×8×8.2=100×8.2=8200.23×1.4+0.23×8.6=0.23×(1.4+8.6)=0.23×10=2.30.125×（80+0.8）=0.125×80+0.125×0.8 =10+0.1=10.164.4-11.2-38.8=64.4-（11.2+38.8）=64.4-50 =14.40.4×0.16×2.5=0...

Simple operation needs formula
4525 ／ 5-749 half ／ [1 - (1 / 3 + 5 / 9)] (12 / 1 + 5 / 6 - 2 / 9) ／ 36 / 0.125 times 3.2 + 12.5% times 5.8-1 ／ 8

4525÷5-749 1/2÷[1-(1/3+5/9)] （1/12+5/6-2/9）÷1/36=905-749 =1/2÷[1-(3/9+5/9)] =（3/36+30/36-8/36）×36=905-（750-1） =1/2÷[1-8/9] =（3+30-8）/36×36=905-750+1 =1/2÷1/9 =33-8=155+1 =1/2×9 =25=15...