1.  The  computer-controlled  pods  will  take  you  wherever  you  want  along  a  fixed  route, whenever you want to go.
2. People can ride at the speed of 25mph.

HT~

1. The coputer-controlled roads will take you wherever you want along a fixed route, whenever you want to go.

2. People can ride at tge speed of 25mph.

*làm lại

\(0,5x-2=x+\frac{2}{3}\)

\(\Leftrightarrow-\frac{1}{2}x=\frac{8}{3}\)

\(\Leftrightarrow x=-\frac{16}{3}\)

#H

0,5x - 2 = x + \(\frac{2}{3}\)

\(-2-\frac{2}{3}=x-0,5x\)

\(-\frac{8}{3}=0,5x\)

\(x=-\frac{16}{3}\)

Thấy đúng k cho tui

Đặt số người ba đội lần lượt là \(a,b,c\)người (\(a,b,c\inℕ^∗\))

Ta có: \(\frac{a}{b}=\frac{11}{5}\Leftrightarrow a=\frac{11}{5}b\).

\(\frac{b}{c}=\frac{35}{17}\Leftrightarrow c=\frac{17}{35}b\)

\(a+b+c=\frac{11}{5}b+b+\frac{17}{35}b=\frac{129}{35}b=387\)

\(\Leftrightarrow b=105\Rightarrow\hept{\begin{cases}a=\frac{11}{5}.105=231\\c=51\end{cases}}\)(thỏa mãn)

\(\frac{1}{100}-\frac{1}{100.99}-\frac{1}{99.98}-\frac{1}{98.97}-...-\frac{1}{3.2}-\frac{1}{2.1}\)

\(=\frac{1}{100}-\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+....+\frac{1}{98.99}+\frac{1}{99.100}\right)\)

\(=\frac{1}{100}-\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{98}-\frac{1}{99}+\frac{1}{99}-\frac{1}{100}\right)\)

\(=\frac{1}{100}-\left(1-\frac{1}{100}\right)=\frac{1}{100}-\frac{99}{100}=-\frac{98}{100}=-\frac{49}{50}\)

\(\frac{1}{100}\)\(-\)\(\frac{1}{100.99}\)\(-\)\(\frac{1}{99.98}\)\(-\)\(\frac{1}{98.97}\)\(-\)\(...\)\(-\)\(\frac{1}{3.2}\)\(-\)\(\frac{1}{2.1}\)

\(=\)\(\frac{1}{100}\)\(-\)\(\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{98.99}+\frac{1}{99.100}\right)\)

\(=\)\(\frac{1}{100}\)\(-\)\(\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{98}-\frac{1}{99}+\frac{1}{99}-\frac{1}{100}\right)\)

\(=\)\(\frac{1}{100}\)\(-\)\(\left(1-\frac{1}{100}\right)\)

\(=\)\(\frac{1}{100}\)\(-\)\(\frac{99}{100}\)

\(=\)\(\frac{-49}{50}\)

Hok tốt

Trả lời :

My sister is keen on swimming, so she goes to the pool three timings a week.

=> three times

~HT~

Em click chuột vào chữ lỗi "timings" để sửa nhé.

a) Hệ số tỉ lệ nghịch \(a\)giữa \(x\)và \(y\)là: \(a=xy=6.2=12\).

b) \(y=\frac{a}{x}=\frac{12}{x}\).

c) \(x=2\)thì \(y=\frac{12}{2}=6\)

\(x=4\)thì \(y=\frac{12}{4}=3\).