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(\(x\) + \(\dfrac{3}{5}\))2 + \(\dfrac{41}{25}\) = 9%: 4,5%
(\(x\) + \(\dfrac{3}{5}\))2 + \(\dfrac{41}{25}\) = 2
(\(x\) + \(\dfrac{3}{5}\))2 = 2 - \(\dfrac{41}{25}\)
(\(x\) + \(\dfrac{3}{5}\))2 = \(\dfrac{9}{25}\)
\(\left[{}\begin{matrix}x+\dfrac{3}{5}=\dfrac{3}{5}\\x+\dfrac{3}{5}=-\dfrac{3}{5}\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=\dfrac{3}{5}-\dfrac{3}{5}\\x=-\dfrac{3}{5}-\dfrac{3}{5}\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=0\\x=-\dfrac{6}{5}\end{matrix}\right.\)
Vậy \(x\in\) {-1; \(\dfrac{1}{5}\)}
a. (x2 - 4).(x+3/5) = 0
TH1: x2 - 4 = 0
x2 = 4
x2 = 22
-22
=> x = 2
-2
Vậy x \(\in\){-2;2}
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=9\%:4,5\%\)
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=2\)
\(\left(x+\frac{3}{5}\right)^2=2-1\frac{16}{25}\)
\(\left(x+\frac{3}{5}\right)^2=\frac{9}{25}=\frac{3}{5}^2\)
\(x+\frac{3}{5}=\frac{3}{5}\)
\(x=\frac{3}{5}-\frac{3}{5}\)
\(x=0\)
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=9\%:4,5\%\)
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=2\)
\(\left(x+\frac{3}{5}\right)^2=2-1\frac{16}{25}\)
\(\left(x-\frac{3}{5}\right)^2=\frac{3^2}{5}\)
\(x=\frac{3}{5}-\frac{3}{5}\)
\(x=0\)
(x + \(\dfrac{3}{5}\))2 + 1\(\dfrac{16}{25}=9\%:4,5\%\)
<=> x2 + (\(\dfrac{3}{5}\))2 + 1\(\dfrac{16}{25}=2\)
<=> x2 + \(\dfrac{9}{25}+\dfrac{41}{25}=2\)
<=> x2 + 2 = 2
<=> x2 = 0
<=> x = 0
@Khánh Linh
huhu ... hoh có ai giúp mình cả 30 Tết mình phải nộp cho thầy rùi . Sợ quá . Sợ nhất là cây thước gỗ của thầy
\(-\dfrac{3}{7}\cdot\dfrac{12}{25}-\dfrac{3}{7}\cdot\dfrac{13}{25}+2\dfrac{2}{7}\)
\(=\dfrac{3}{7}\cdot\left(-\dfrac{12}{25}\right)-\dfrac{3}{7}\cdot\dfrac{13}{25}+\dfrac{16}{7}\)
\(=\dfrac{3}{7}\cdot\left(-\dfrac{12}{25}-\dfrac{13}{25}\right)+\dfrac{16}{7}\)
\(=\dfrac{3}{7}\cdot\left(-1\right)+\dfrac{16}{7}\)
\(=-\dfrac{3}{7}+\dfrac{16}{7}\)
\(=\dfrac{13}{7}\)
` -3/7 . 12/25 - 3/7 . 13/25 + 2(2)/7 = -3/7 ( 12/25 + 13/25 ) + 2(2)/7 = -3/7 . 25/25 + 2(2)/7 = -3/7 . 1 + 2(2)/7 = -3/7 + 16/7 = 13/7 `
(- \(\dfrac{2}{5}\))2 + \(\dfrac{1}{2}\) x (4,5 - 2) - 25%
= \(\dfrac{4}{25}\) + \(\dfrac{1}{2}\) x 2,5 - 0,25
= 0,16 + 1,25 - 0,25
= 0,16 + (1,25 - 0,25)
= 0,16 + 1
= 1,16