80kg = 8 yến      46 yến = 460kg   5200kg = 53 tạ  5 tấn < 5010kg  490 yến = 49 tạ  70 tạ = 7 tấn 

SSH=(1990-6):4+1=497

Tổng=(1990+6)x497:2=496006

Nửa chu vi hình chữ nhật là :

48 : 2 = 24 ( cm )

Tổng số phần bằng nhau là :

3 + 1 = 4 ( phần )

Chiều dài hình chữ nhật là :

24 : 4 x 3 = 18 ( m )

Chiều rộng hình chữ nhật là :

24 - 18 = 6 ( m )

Ta có:diện tích của thửa ruộng là:

DÀI x RỘNG=243(m²)

mà chiều dài gấp 3 lần chiều rộng nên ta thay chiều dài là bằng:3 RỘNG

khi đó ta có: RỘNG x 3 RỘNG =243(m²)

Đặt chiều rộng là x(m) thì suy ra :     x.3x=243   =>3x²=243

Vậy chiều rộng là 9(m)       suy ra chiều dài =243/9=27(m)

Suy ra được chu vi thửa ruộng =(DÀI+RỘNG)x2=72(m)

HỌC TỐT!!!

Bạn nên để toán của lớp mấy SAO CHO PHÙ HỢP để người giải dễ dàng hơn nha !!!!

80 kg = 8 yến  46 yến = 460kg 5200kg<53 tạ  5 tấn < 5010kg  490 yến = 49 tạ 70 tạ = 7 tấn

Cốt truyện gồm 3 phần là: mở đầu, diễn biến và kết thúc

Gọi x(l) là số nước ở thùng bé

y(l) là số nước ở thùng lớn

x+y=241(1)

Nếu thêm vào 49 lít nước thì số nước ở 2 thùng bằng nhau nên ta có:x+49=y(2)

Từ (1) và (2) suy ra :x=96(l)              y=145(l)

I have a best friend, and his name is Minh. Minh has been my classmate since we were in elementary school, and it means that we have been friends for more than ten years. Minh lives near my house, so it can be said that he is also my neighbor. He is a chubby boy with curly black hair. He wears a pair of very thick classes since he is short eye sighted. He has been wearing them since he was a little boy, and it is hard to recognize him without his classes even for me. Minh is a good student at our school, but in return he is pretty bad at outdoor activities and sports. He spends most of his time studying, and his free time is used for playing video games or eating. I am his best friend, but my appearance is the total opposite from him. I am a tall and slim girl, and I love to play sports basketball and badminton. I try my best to take him outside, but I usually fail to do so. Instead, I will sit down and play games with him, and after that we will go outside to get something to eat. He helps me a lot with the school work, and we usually study together. We do our own homework, but after that we will exchange our notebooks to check each other's result. Every morning he stops by my house and waits for me to go to school together. We ride our own bikes, but recently his mother has an idea for him to work out that he has to take me to school on his bike as his morning exercise. Although he is not a prominent boy, most of the classmates still him because of his kind and gentle personality. I am proud to have a friend him, and I think that we are totally suitable for each other.

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