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30 tháng 6 2023
Tỉ lệ giữa rơm tươi và rơm khô là:
55%:10%=11/2
Khối lượng rơm khô thu được là:
1000*2/11=2000/11(kg)
KY
15 tháng 7 2021
1. Fill in each gap with ONE suitable word to complete the passage. England is not a large (1)___ country______. No town (2)_____in____England is very far (3)___ from______the sea and many English families spend their summer holidays at (4)____ the_____seaside. There are no high mountains in England, no very (5)____ long_____ rivers and no very large forests. There are many towns in (6)____ England_____. No town is very far from another. The English countryside between the towns is like the carpet of many (7)____ colors____. In (8)___ Spring_____and summer, the fields, meadows and forests (9)____ are____ light green or dark green and the gardens are green, red, blue, yellow and white (10)____ with_____flowers
2. Read the following passage and answer the questions
Miss. Lan lives in Hanoi. She teaches Literature at a school in Hanoi. She goes to work by bus every morning. She has two days off a week: Saturday and Sunday. She has a bicycle but she never cycles to work because it’s too far from her house to her school. Her work starts at 8.00 am and finishes at 4.00 pm. After work, she usually goes swimming in the swimming pool or plays badminton. She comes back home at 7.00 pm and has dinner. After dinner, she is always busy marking her students’ papers. Sometimes she watches TV. She feels happy with her job.
1. Where does Miss Lan work? She works at a school in Ha Noi.
2. How many days a week does she go to work? She goes to work five days a week.
3. Why doesn’t she ride her bike to work? Because it's too far from her house to her school.
4. Is she free after dinner? No,she doesn't.
5. How does she feel with her job?
She feels happy with her job.
AD
25 tháng 7 2021
a)\(-\frac{3}{4}x+\frac{1}{6}x=1-2\frac{5}{9}\)
\(\Leftrightarrow-\frac{7}{12}x=-\frac{14}{9}\)
\(\Leftrightarrow x=\frac{8}{3}\)
b)\(\left|2n-\frac{3}{8}\right|+2\frac{3}{4}=3\frac{1}{16}\)
\(\Leftrightarrow\left|2n-\frac{3}{8}\right|=\frac{5}{16}\)
\(\Leftrightarrow\orbr{\begin{cases}2n-\frac{3}{8}=\frac{5}{16}\\2n-\frac{3}{8}=-\frac{5}{16}\end{cases}\Leftrightarrow\orbr{\begin{cases}2n=\frac{11}{16}\\2n=\frac{1}{16}\end{cases}\Leftrightarrow}}\orbr{\begin{cases}x=\frac{11}{32}\\x=\frac{1}{32}\end{cases}}\)
c)\(\left(x-\frac{1}{5}\right)^2+1\frac{9}{25}=2\)
\(\Leftrightarrow\left(x-\frac{1}{5}\right)^2=\frac{16}{25}\)
\(\Leftrightarrow\orbr{\begin{cases}x-\frac{1}{5}=\frac{4}{5}\\x-\frac{1}{5}=-\frac{4}{5}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=1\\x=-\frac{3}{5}\end{cases}}}\)
#H
2
8 tháng 5 2022
`a)(a+b)^2 <= 2(a^2+b^2)`
`<=>a^2+2ab+b^2 <= 2a^2 + 2b^2`
`<=>a^2-2ab+b^2 >= 0`
`<=>(a-b)^2 >= 0` (Luôn đúng `AA a,b`)
Vậy đẳng thức được c/m
_________________________________________
`b)(a+b+c)^2 <= 3(a^2+b^2+c^2)`
`<=>a^2+b^2+c^2+2ab+2ac+2bc <= 3a^2+3b^2+3c^2`
`<=>2a^2+2b^2+2c^2 -2ab-2ac-2bc >= 0`
`<=>(a^2-2ab+b^2)+(a^2-2ac+c^2)+(b^2-2bc+c^2) >= 0`
`<=>(a-b)^2+(a-c)^2+(b-c)^2 >= 0` (Luôn đúng `AA a,b,c`)
Vậy đẳng thức được c/m
10 tháng 8 2020
a) Số số hạng của dãy là: \(\frac{\left(x-2\right)}{2}+1=\frac{x-2+2}{2}=\frac{x}{2}\)
pt <=> \(\frac{\left(x+2\right).x}{2}:2=10302\)
<=> \(x\left(x+2\right)=41208\)
<=> \(x^2+2x=41208\)
<=> \(x^2-202x+204x-41208=0\)
<=> \(\left(x-202\right)\left(x+204\right)=0\)
<=> \(\orbr{\begin{cases}x=202\\x=-204\end{cases}}\)
Do x phải > 0 => \(x=202\)
10 tháng 8 2020
b) Số số hạng của dãy là: \(\frac{\left(y-1\right)}{3}+1=\frac{y-1+3}{3}=\frac{y+2}{3}\)
pt <=> \(\frac{\left(y+1\right).\left(y+2\right)}{3}:2=1717\)
<=> \(\left(y^2+3y+2\right)=10302\)
<=> \(y^2+3y-10300=0\)
<=> \(y^2-100y+103y-10300=0\)
<=> \(\left(y-100\right)\left(y+103\right)=0\)
<=> \(\orbr{\begin{cases}y=100\\y=-103\end{cases}}\)
Do y phải > 0 => \(y=100\)
YN
19 tháng 2 2020
Ta có :
- x + 21 = 15 + 2x
=> 21 - 15 = 2x + x
=> 6 = 3x
=> x = 2
Vậy x = 2
19 tháng 2 2020
-x+21=15+2x
=> -x-2x=15-21
=> -3x=-6
=> x=2
TL:
in
~HT~
at nha bạn