Analyzing the distance of translation is to look at the distance between a set of corresponding points of the images before and after translation, rather than the distance between two images. Therefore, figure A in the right picture is translated downward (3 squares) to get figure B. ..
Point 2, choose one.
Will rotate around a point 180, what is the possible figure?
Rotation analysis requires that each edge and each part of the graph rotate together and the size remains the same. The diagonal of the original image is shorter after rotating 180, and the correct option is (④).
Key point 3 100000= () ten thousand.
9990000000≈ () billion
To analyze this problem, the first thing to fill in the blanks is the rewriting of numbers, followed by the approximation of numbers. The examination of questions must be rigorous and meticulous. Rewrite the integer into "ten thousand", remove the four zeros after the original number, copy other parts, and add the word "ten thousand" after it. To rewrite it into a divisor with the unit of "100 million", it is necessary to omit the mantissa after 100 million and make it accurate to 100 million digits, so as to see the digits clearly. The correct answers are 10 and 100.
The product of two multipliers at point 4 is 68, one of which is multiplied by 6 and the other by 25, so the product is multiplied by ().
The analysis of this problem examines the changing law of product, and children are prone to make mistakes if they don't look at the problem carefully. Follow your heart! I have done the product problem in my usual practice (), so I take it for granted. In fact, when we look at the problem, we should circle the keyword "multiplication". This question asks what the product is, not what the product is. So the correct answer is 150.
Point 5: Uncle Li has 129 ginkgo trees. Last year, each tree harvested an average of 68 kilograms of ginkgo biloba. This year, it is estimated that each tree will harvest 19 kg more than last year. How many kilograms of ginkgo is expected to be harvested this year?
Analyzing this problem is the practical application of multiplying three digits by two digits in solving problems. The problem that students tend to overlook is how many kilograms of ginkgo can be harvested this year and how many kilograms of ginkgo can be harvested this year, which leads to mistakes. Look at the questions carefully, make clear the conditions, and look at the problems before you start. Circle the keyword "duo" and focus on the quantitative relationship. You can use a simple algorithm (19×129 = 2451(kg)) to calculate the number of kilograms expected to be harvested this year, or you can use the number of kilograms that can be harvested this year (68+ 19 )× 128.
Hope to adopt