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Từ bài toán, ta có sơ đồ:
Chiều dài: |----|----|----|
Chiều rộng: |----|----|
Tổng số phần bằng nhau là:
\(3+2=5(phần)\)
Giá trị mỗi phần là:
\(300:5=60(m)\)
Chiều dài là:
\(60\cdot3=180(m)\)
Chiều rộng là:
\(300-180=120(m)\)
Diện tích lô đất là:
\(180\cdot120=21600\left(m^2\right)\)
Các công nhân còn lại phải hoàn thành trong:
12*4:8=48:8=6(ngày)
I. Nội qui tham gia "Giúp tôi giải toán"
1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;
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Xin chào các bạn
Thu được số kg rau là: 3600:100x30=1080 (kg)
Vậy thu được 1080 kg rau
Xin chào các bạn
Bài làm :
Số rau thu được là :
3600 ÷ 100 x 30 = 1080 ( kg )
Đáp số : 1080 kg
Chúc bạn học giỏi
Ta biết xích lô có 3 bánh còn xe đạp có 2 bánh.
Vậy có số xích lô là: 80:(2+3)*3:3=16(xích lô)
Có số xe đạp là:80:(2+3)*2:2=16(xe đạp)
Số tiền được giảm là:
\(240000:100\times10=24000\) (đồng)
Số tiền mà Ngọc phải trả để mua chiếc balo đó là:
\(240000-24000=216000\) (đồng)
Đ/s:....
Giá ba lô khi giảm 10%:
240 000x (100%-10%) = 216 000 (đ)
Bài giải
Trung bình cộng mỗi em nặng số kg là :
\(\left(31+38+35+40+36\right)\div5=36\left(kg\right).\)
Đáp số : 36 kg .
Trung bình mỗi em nặng số ki-lô-gam là
\(\frac{31+38+35+40+36}{5}\)=\(36\)\((kg)\)
Đáp số 36 kg
Học tốt
Passage 1: Read the following passage and mark the letter A, B, C, or D to choose the word or phrase that best fits each of the numbered blanks from 1 to 5.
Left-handers are the odd ones out. Sure, lefties (1) ______up about 10 percent of the population - but, frankly, it seems like society has forgotten about them. Just consider all of the right-handed gadgets, awkwardly designed desks, and cooking tools that fit comfortably only in your right hand. What (2) ______someone to become a lefthand? Scientists aren’t exactly sure, but research points to a complex (3) ______between genes and environment While no exact set of “leftie genes” have been discovered, people who dominantly use their left hands do have more left-handed family members. And researchers have found different brain wirings in righties vs. lefties. But no matter (4) ______it is that drives someone to use their antipodal paw, science has also uncovered a particular set of personality traits that left-handed people tend to have. So for all of you lefties, leftie-loving righties, and ambidextrous folks out there - it’s time to brush up on your left-handed knowledge and help (5) ______an end to leftie discrimination once and for all.
1: A. consist B. account C. hold D. make
2: A. causes B. makes C. gets D. does
3: A. collaborate B. collaboration C. collaborating D. collaborated
4: A. which B. who C. what D. that
5: A. put B. bring C. make D. take
Passage 2: Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 6 to 12.
Successful students often do the followings while studying. First, they have an overview before reading. Next, they look for important information and pay greater attention to it (which often needs jumping forward or backwards to process information). They also relate important points to one another. Also, they activate and use their prior knowledge. When they realize that their understanding is not good, they do not wait to change strategies. Last, they can monitor understanding and take action to correct or “fix up” mistakes incomprehension.
Conversely, students with low academic achievement often demonstrate ineffective study skills. They tend to assume a passive role, in learning and rely on others (e.g., teachers, parents) to monitor their studying, for example, low-achieving students often do not monitor their understanding of content; they may not be aware of the purpose of studying, and they show little evidence of looking back or employing “fix-up” strategies to fix understanding problems. Students who struggle with learning new information seem to be unaware that they must extent effort beyond simply reading the content to understand and remember it. Children with learning disabilities do not plan and judge the quality of their studying. Their studying may be disorganized. Students with learning problems face challenges with the personal organization as well. They often have difficulty keeping track of materials and assignments, following directions, and completing work on time. Unlike good studiers who employ a variety of study skills in a flexible yet purposeful manner, low-achieving students use a restricted range of study skills. They cannot explain why good study strategies are important for learning, and they tend to use the same, often ineffective study approach for all learning tasks, ignoring task content, structure or difficulty.
(Source: Adapted from Study Skills: Managing Your Learning — NUI Galway)
6: What is the topic of the passage?
A. Successful and low-academic achieving students
B. Successful learners and their learning strategies
C. Study skills for high school students
D. Effective and ineffective ways of learning
7: The word “prior” in the first paragraph is the closest meaning to ______?
A. important B. earlier C. forward D. good
8: According to the passage, what can be learnt about passive students?
A. They depend on other people to organize their learning
B. They are slow in their studying
C. They monitor their understanding
D. They know the purpose of studying
9: Which of the followings is NOT evidence of monitoring studying?
A. Being aware of the purpose of studying
B. Monitoring their understanding of content
C. Fixing up mistakes in understanding
D. Looking at their backs
10: According to the passage, to learn new information, low-achieving students do NOT______.
A. just understand it B. relate it to what they have known
C. simply remember it D. read it
11: In compared with low-achieving students, successful students use______.
A. aimless study techniques B. various study skills
C. restricted strategies D. inflexible study ways
12: The underlined pronoun “They” in the last sentence refers to______.
A. study strategies B. study skills
C. low-achieving students D. good studiers
a) Giá của ba lô ban đầu là :
510 000 : ( 100 - 15 ) x 100 = 600 000 đồng
Giá ban đầu của áo thun là :
180 000 : ( 100 - 10 ) x 100 = 200 000 đồng
b) Nếu mẹ mua 10 cái ba lô giảm giá thì phải trả số tiền là :
600 000 x 10 : 100 x ( 100 - 5 ) = 5700 000 đồng
Mẹ phải trả số tiền là :
5700 000 x 5 = 28 500 000 đồng
~ Thiên Mã ~

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