For two pieces of cloth of the same length, the first one takes 32 meters, and the second one takes 20 meters. As a result, the second one is three times as many meters as the first one?

For two pieces of cloth of the same length, the first one takes 32 meters, and the second one takes 20 meters. As a result, the second one is three times as many meters as the first one?

According to the meaning of the question: the second piece has more meters than the first piece: 32-20 = 12 (meters); according to the difference multiple formula: the remaining meters of the first piece are: 12 (3-1) = 6 (meters); the original length of the two pieces of cloth: 6 + 32 = 38 (meters). Answer: the original length of the two pieces of cloth is 38 meters

For two pieces of cloth of the same length, the first one takes 32 meters, and the second one takes 20 meters. As a result, the second one is three times as many meters as the first one?

According to the meaning of the question: the second piece has more meters than the first piece: 32-20 = 12 (meters); according to the difference multiple formula: the remaining meters of the first piece are: 12 (3-1) = 6 (meters); the original length of the two pieces of cloth: 6 + 32 = 38 (meters). Answer: the original length of the two pieces of cloth is 38 meters

For two pieces of cloth of the same length, the first one takes 32 meters, and the second one takes 20 meters. As a result, the second one is three times as many meters as the first one?

According to the meaning of the question: the second piece has more meters than the first piece: 32-20 = 12 (meters); according to the difference multiple formula: the remaining meters of the first piece are: 12 (3-1) = 6 (meters); the original length of the two pieces of cloth: 6 + 32 = 38 (meters). Answer: the original length of the two pieces of cloth is 38 meters

A house with a length of 5 meters and a width of 4 meters needs at least 20 square decimeters of floor tiles

5 * 4 = 20 square meters = 2000 square decimeters
So 2000 / 20 is 100 yuan

A house of 5 meters long and 4 meters wide needs to be paved with 20 square decimeters of floor tiles. How many pieces at least

5 × 4 = 20 square meters = 2000 square decimeters
2000 △ 20 = 100 pieces
It will cost at least 100 yuan

A house with a length of 5.4 meters and a width of 4.5 meters should be paved with square tiles on the floor of the house, and each tile should have the largest area. How many tiles should be used at least?

30 pieces, each piece 90cm * 90cm

Known 2 + 2 / 3 = 2 ^ 2x2 / 3, 3 + 3 / 8 = 3 ^ 2x3 / 8, 4 + 4 / 15 = 4 ^ 2x4 / 15, 20 + A / b = 20 ^ 2xa / B, known 2 + 2 / 3 = 2^
Sorry to copy wrong, find the value of a ^ 2 + 2Ab + B ^ 2 / - A ^ 2 + B ^ 2.

A = 20, B = 20 ^ 2-1 = 399, the original formula = 419 / 379

1000-1-1-2-4...-99-100=

Can you write more formulas so that you can't see the law

1000-1-2-3-4-...-99-100

1000-1-2-3-4-...-99-100
=1000-（1+2+3+4+5+…… +99+100）
=1000-101*50
=1000-5050
=-4050

1000－1－2－3－.－99－100=

1000-5050
=-4050