A pencil has been used for two fifths of the way out, and there are 12 centimeters left, how many ce

Hello! The solution process is as follows: two fifths are used, then the rest is 1-2 5 = 3 5, so the total length is: 12 3 5 = 20 cm.

12*5 3=20 cm, your question is simple, the pencil is divided into five equal parts, one is 4 cm, so the pencil is 20 cm, I hope it can help you!

A pencil, using 2 5, has 3 5 left, and 12 centimeters remaining, so the original length of this pencil is 12 (3 5) = 20 (centimeters).

Divide 12 by 3 times 5, and the original length of this pencil is 20 centimeters.

Three-fifths of the pencil is exactly 12 centimeters, so this pencil is 20 centimeters long.

This question requires you to convert the units and convert them into centimeters, so the length of this pencil is ten centimeters, and 20 millimeters are used, that is, two centimeters are used, so there should be 10-2 = 8 centimeters left in this pencil.

Hello, this question examines the conversion of centimeters, millimeters, and decimeters. First of all, 1 decimeter is equal to 10 centimeters and is equal to 100 millimeters, so the unified centimeter is 10-2 = 8 centimeters, and there are 8 centimeters left in this pencil.

Since a pencil has 20 centimeters, then 20 centimeters is equal to 2 decimeters. And because 110 millimeters is equal to 11 centimeters and is equal to decimeters. Therefore, it is said that the use of filial piety 2 is subtracted, that is, the remaining length of the pencil reading manuscript is used. Dm.

1 decimeter is equal to 10 centimeters is equal to 100 millimeters, and the pencil of 20 centimeters is used to guess that 110 millimeters are left, leaving 20x10 110 90 millimeters, that is, equal to 9 centimeters equal to decimeters of rice ears sold.

First turn centimeters into millimeters, and 20 centimeters equals 200 millimeters, because centimeters and millimeters are decimal places. 200 mm minus 110 equals 90 mm is the length of the pencil left in turning millimeters into decimeters. Because that's the requirement in the question.

200-110 = 90 (mm) = decimeter) because the decimeter and the millimeter are hundred-digit decimeters larger than the millimeter, so 90 millimeters are equal to the decimeters. Manuscript silver.

A pencil and a pencil, 20cm used 110mm, how many decimeters are left? Replace the order with the same result as equal. Name.

Solution: Let the second one be x cm long.

x-2）×3=

x-2=x-2=

x=x=

The second pencil turned out to be x centimeters long.

3 (x-2) = x = centimeter.

Solution: According to the meaning of the question, it can be known: because the first time I used 3 cm, the second time I used 5 cm, and the two times I shared:

3+5 8 cm, so this pencil is 8 cm less than the original.

A: This pencil is 8 cm less than the original.

12 3 5 = 4, now this pen has 4 cm left, 12 4 = 8, so this pen is 8 cm less than the original.

3+5=8, this pencil is 8 cm less than the original.