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(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
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=9\%:4,5\%\)
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=2\)
\(\left(x+\frac{3}{5}\right)^2=2-1\frac{16}{25}\)
\(\left(x+\frac{3}{5}\right)^2=\frac{9}{25}=\frac{3}{5}^2\)
\(x+\frac{3}{5}=\frac{3}{5}\)
\(x=\frac{3}{5}-\frac{3}{5}\)
\(x=0\)
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=9\%:4,5\%\)
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=2\)
\(\left(x+\frac{3}{5}\right)^2=2-1\frac{16}{25}\)
\(\left(x-\frac{3}{5}\right)^2=\frac{3^2}{5}\)
\(x=\frac{3}{5}-\frac{3}{5}\)
\(x=0\)
(\(x\) + \(\dfrac{3}{5}\))2 + \(\dfrac{41}{25}\) = 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; \(\dfrac{1}{5}\)}
tao là N nè kqua phần a ra 20/3, phần b là 2.5 còn phần c tao làm rồi nhưng không chắc
1.
a) \(\frac{13}{8}:\frac{13}{4}=\frac{1}{2}=0,5=50\%\)
b) \(12,5:2,5=5=500\%\)
~ Hok tốt ~
2.
\(\left(\frac{37}{9}+\frac{13}{4}\right).\frac{9}{4}+\frac{11}{4}\)
\(=\frac{265}{36}.\frac{9}{4}+\frac{11}{4}\)
\(=\frac{265}{16}+\frac{11}{4}\)
\(=\frac{309}{16}\)
\(1+\left(\frac{9}{10}-\frac{4}{5}\right):\frac{19}{6}\)
\(=1+\frac{1}{10}:\frac{19}{6}\)
\(=1+\frac{3}{95}\)
\(=\frac{98}{95}\)
\(\left(-7+\left|13\right|\right)-\left(13-\left|-7\right|-25\right)-\left(25+\left|-10\right|-9\right)\)
\(=\left(-7+13\right)-\left(13-7-25\right)-\left(25+10-9\right)\)
\(=-7+13-13+7+25-25-10+9\)
\(=\left(-7+7\right)+\left(13-13\right)+\left(25-25\right)-10+9\)
\(=0+0+0-10+9\)
\(=-10+9\)
\(=-1\)
~ Hok tốt ~
a. (x2 - 4).(x+3/5) = 0
TH1: x2 - 4 = 0
x2 = 4
x2 = 22
-22
=> x = 2
-2
Vậy x \(\in\){-2;2}
1.
a)
3/4- 3/2+1/2 . 12/5
=-3/4+6/5
=9/20
b)
8 . x-7,8 . x=25
0,2 x= 25
x=25 : 0,2
x=125
c)1/4 . 4/3 . 30. 1/2. 8/45
=8/9
đ) 9/2+ 3/4 x =27/8
3/4x= -9/8
x=-9/8 : 3/4
x=-3/2
b2:
a) 13/15 . 3/4-(8/15+1/4)
=39/60 - 47/60
= -8/60 = -2/15
a/\(-\dfrac{1}{6}+\left(-\dfrac{5}{8}+\dfrac{7}{6}\right)\)
\(=\left(-\dfrac{1}{6}+\dfrac{7}{6}\right)-\dfrac{5}{8}\)
\(=1-\dfrac{5}{8}\)
\(=\dfrac{8}{8}-\dfrac{5}{8}=\dfrac{3}{8}\)
b/\(\left(\dfrac{2}{5}\right)^2+5\dfrac{1}{2}\cdot\left(4,5-2\right)+\dfrac{2^3}{\left(-4\right)}\)
\(=\dfrac{4}{25}+\dfrac{11}{2}\cdot\dfrac{5}{2}+-\dfrac{2^3}{2^2}\)
\(=\dfrac{4}{25}+\dfrac{55}{4}+\left(-2\right)\)
\(=\dfrac{16}{100}+\dfrac{1375}{100}-\dfrac{200}{100}\)
\(=\dfrac{1191}{100}=11,91\)
`a)-4/9(5/6*90%-8:0,32)`
`=-4/9(5/6*9/10-8:8/25)`
`=-4/9(3/4-25)`
`=-4/9*(-97)/4=97/9`
`b)(2/5)^2+5 1/2.(4,5-2)+(2^3)/(-4)`
`=4/25+11/2*5/2+8/(-4)`
`=4/25+55/4-2`
`=1191/100`
\(=\dfrac{4}{25}+\dfrac{1}{2}\left(\dfrac{9}{2}-2\right)-\dfrac{1}{4}=\dfrac{4}{25}+\dfrac{1}{2}\left(\dfrac{5}{2}\right)-\dfrac{1}{4}=\dfrac{4}{25}+\dfrac{5}{4}-\dfrac{1}{4}=\dfrac{4}{25}+1=\dfrac{29}{25}\)
`(-2/5)^2 + 1/2 . (4,5 - 2) - 25%`
`=4/25 + 1/2 . (9/2 - 2) - 1/4`
`=4/25 + 1/2 . (9/2 - 4/2)-1/4`
`=4/25 + 1/2 . 5/2 - 1/4`
`=4/25 + 5/4 - 1/4`
`=4/25 + 1`
`=4/25 + 25/25`
`=29/25`