40 chu di 2
K
Khách
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19 tháng 4 2017
cạnh của chiều dài (hay chiều rộng) sau khi giảm là:
40/4=10 (cm)
vậy chiều dài là:
10 + 3 = 13(cm)
chiều rộng là:
10 - 2 = 8(cm)
Vậy diện tích HCN là:
13 x 8 =104 (cm2)
VH
19 tháng 4 2017
độ dài 1canh hình vuông là 40:4=10cm
chiều dài là 10+3 =13cm
chiều rộng =10+2=12cm
diện tích = 13 nhân 12=156 cm vuông
16 tháng 5 2017
Bài 3:
Ta có: 3 giờ 40 phút= \(\dfrac{11}{3}\left(giờ\right)\)
+) Gọi vận tốc lúc đi là x (km/h) (x>0)
Khi đó vận tốc lúc về là x+5 (km/h)
+) Quãng đường lúc đi là 4x (km)
Quãng đường lúc về là \(\dfrac{11}{3}.\left(x+5\right)\left(km\right)\)
+) Vì đi và về trên cùng 1 quãng đường, nên:
\(4x=\dfrac{11}{3}.\left(x+5\right)\\ < =>4x=\dfrac{11}{3}x+\dfrac{55}{3}\\ < =>4x-\dfrac{11}{3}x=\dfrac{55}{3}\\ < =>\dfrac{1}{3}x=\dfrac{55}{3}\\ =>x=\dfrac{\dfrac{55}{3}}{\dfrac{1}{3}}=55\left(TMĐK\right)\)
Vậy: quãng đường Nha Trang- Phan Thiết dài: 55.4= 220(km)
MA
4
12 tháng 8 2017
Gọi chiều dài là a,chiều rộng là b
Ta có:a-3=b
=>a=b+3 mà a+b+3=20cm
=>2b=17cm =>b=8,5 cm
=>a=8,5+3=11,5cm
Diện tích lúc đàu là:
8,5x11,5=97,75( cm2)
Đáp số:97,75 cm2
2 tháng 10 2016
The zoo is an artificial forest created by man. Though there are few trees compared with the natural forest, the animals, birds and other creatures found in the zoo must always remind us of the forest. It is indeed an interesting place to visit.
Even in the natural forest such a variety of animals, birds and other creatures cannot be found as in a big zoo. Animals which are not found in the forests of one country are caught in other parts or the world and brought to the zoo. The lion, for example, is not found in Malaysia; but one may see an African lion in the zoo at Johore Bahru.
Until I visited the zoo at Johore Bahru a few months ago, I had no idea how informative a visit to a zoo might be. Though the zoo at Johore Bahru is not big, I found many kinds of interesting animals and other creatures there. Lions, tigers and other animals were moving about lazily in their cages. Some of the animals appeared to be bored, and they took little interest in the visitors. The monkeys, however, showed their natural agility. Whenever they saw a visitor, they ran towards him and begged for something to eat. I was indeed amused at their behavior. Most of them were caught in Malaysia and their variety was amazing.
Some of the birds too were very interesting to see. Their beautiful feathers fascinated me. Birds are indeed one of the loveliest creations of god. A few birds are larger than many animals.
The lions and the tigers in this zoo were so docile that I could not but treat them as domestic animals like the dog and the cat. I went very close to them, but they showed little interest in me. I then began to think of how the animal or even human spirit could be broken by confinement. Confined to their cages, these animals had become spiritless. Even the sight of food did not see to excite them much.
Then, there was the crocodile with its usual pretence of innocence. It refused to be disturbed. Heaven knows how it might have reacted if a child had fallen into its pit. However, my visit to the zoo had increased my knowledge of animals.
3 tháng 10 2016
The zoo is an artificial forest created by man. Though there are few trees compared with the natural forest, the animals, birds and other creatures found in the zoo must always remind us of the forest. It is indeed an interesting place to visit.
Even in the natural forest such a variety of animals, birds and other creatures cannot be found as in a big zoo. Animals which are not found in the forests of one country are caught in other parts or the world and brought to the zoo. The lion, for example, is not found in Malaysia; but one may see an African lion in the zoo at Johore Bahru.
Until I visited the zoo at Johore Bahru a few months ago, I had no idea how informative a visit to a zoo might be. Though the zoo at Johore Bahru is not big, I found many kinds of interesting animals and other creatures there. Lions, tigers and other animals were moving about lazily in their cages. Some of the animals appeared to be bored, and they took little interest in the visitors. The monkeys, however, showed their natural agility. Whenever they saw a visitor, they ran towards him and begged for something to eat. I was indeed amused at their behavior. Most of them were caught in Malaysia and their variety was amazing.
Some of the birds too were very interesting to see. Their beautiful feathers fascinated me. Birds are indeed one of the loveliest creations of god. A few birds are larger than many animals.
The lions and the tigers in this zoo were so docile that I could not but treat them as domestic animals like the dog and the cat. I went very close to them, but they showed little interest in me. I then began to think of how the animal or even human spirit could be broken by confinement. Confined to their cages, these animals had become spiritless. Even the sight of food did not see to excite them much.
Then, there was the crocodile with its usual pretence of innocence. It refused to be disturbed. Heaven knows how it might have reacted if a child had fallen into its pit. However, my visit to the zoo had increased my knowledge of animals.
7 tháng 5 2018
Đổi: 2 giờ 15 phút = 2,25 giờ
Vận tốc đi xe máy của chú Phương là:
94,5 : 2,25 = 42 (km/giờ)
Đáp số : 42 km/giờ
40 - 2 = 38
Hok tốt.