The height of the desk 2 mm higher than the standard height is recorded as+2 mm, so what is the height 3 mm lower than the standard height? Existing 5

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Selected answers

Topic content:

If the height of the desk is 2 mm higher than the standard height, it will be recorded as+2 mm. If it is 3 mm lower than the standard height, what will be recorded as

There are five desks, and their dimensions are 1 mm, - 1 mm, 0 mm,+3 mm, - 1.5 mm longer than the standard dimensions. If it is specified that the height of the desks should not be 2 mm higher than the standard height at the highest and 2 mm lower than the standard height at the lowest, it is qualified. How many desks are unqualified?

Best answer:

-3mm, 1 unqualified

Answer analysis:

Judgement can be made according to the relativity of positive and negative numbers

The height of the desk 2 mm higher than the standard height is recorded as+2 mm, and the height 3 mm lower than the standard height is recorded as - 3 mm.

One of the above five desks is unqualified

Comment: Conceptual questions are the basis of mathematics learning, which is very important. However, such questions often have independent knowledge points, so they are not very common in the middle school entrance examination. They often appear in the form of blank filling questions and multiple-choice questions. They are basic questions with ordinary difficulty

Test core:

Positive Number: negative number (real number) greater than 0: negative number (real number) less than 0 is neither positive nor negative.

Non negative number: positive number and zero. Non positive number: negative number and zero.

The old city warms people's hearts 2024-06-23 11:55:12

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The central idea of animal jokes

The central idea of Animal Laughter: This popular science article introduces the interesting things that happened when the author observed the behavior of water ducks, parrots and other animals, including the absurd experience of the author getting along with them, as well as the loveliness of the little teal and the "mischief" of the big parrot. It not only shows the author's rigorous and realistic scientific attitude and lofty scientific spirit, but also shows the mood of peaceful coexistence between people and animals, and people's respect and love for animals, triggering people's love for animals and thinking about human behavior.
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Animal Laughter was selected from King Solomon's Ring and included in Lesson 17 of Grade 7 Volume 1 (PEP 2016) (in 2017, due to the adjustment of the textbook and text, the number of lessons in this article was increased to Lesson 17). The author, Konrad Lorenz, is an Austrian animal behaviorist, animal psychologist, ornithologist and Nobel Prize winner. He is often recognized as one of the founders of modern animal behavior. He developed a method from an early generation, learned instinctive behavior from his teacher Oscar Heinroz Lorenz, and used it in some birds (especially stucco geese, jackdaws and domestic geese). He also rediscovered the principle seal (originally described from Douglas Spalding) on the birds with unpleasant behavior.

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Translation:
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