5 x 5 x 5 + 16 = ?
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a, \(\left(\frac{4}{9}.\frac{3}{7}\right).\frac{7}{4}=\frac{4}{9}\left(\frac{3}{7}.\frac{7}{4}\right)=\frac{4}{9}.\frac{3}{4}=\frac{3}{9}=\frac{1}{3}\)
b, \(\left(\frac{6}{5}.\frac{4}{5}\right).\frac{25}{16}=\frac{6}{5}\left(\frac{4}{5}.\frac{25}{16}\right)=\frac{6}{5}.\frac{5}{4}=\frac{6}{4}=\frac{3}{2}\)
c, \(\left(\frac{7}{8}.\frac{16}{9}\right).\frac{3}{14}=\frac{7}{8}\left(\frac{16}{9}.\frac{3}{14}\right)=\frac{7}{8}.\frac{8}{21}=\frac{7}{21}=\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 4/9 x 3/7 ) x 7/4 = 4/9 x ( 3/7 x 7/4 ) =4/9 x 21/28 = 84/252
( 6/5 x 4/5 ) x 25/16 = ( 25/16 x 4/5 ) x 6/5 = 100/80 x 6/5 = 600/400
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\begin{array}{l}2{\rm{x}} + 5 = 16\\2{\rm{x}} = 16 - 5\\2{\rm{x}} = 11\\x = \frac{{11}}{2}\end{array}\)
Như vậy, bạn Vuông giải đúng, bạn Tròn giải sai
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{7}{9}\times\dfrac{13}{25}\times\dfrac{9}{7}=\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{13}{25}=1\times\dfrac{13}{25}=\dfrac{13}{25}\)
b) \(\dfrac{5}{9}\times\dfrac{21}{25}+\dfrac{21}{25}\times\dfrac{4}{9}\)
\(=\dfrac{21}{25}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\)
\(=\dfrac{21}{25}\times1=\dfrac{21}{25}\)
c) \(\dfrac{19}{5}\times\dfrac{11}{16}-\dfrac{9}{5}\times\dfrac{11}{16}\)
\(=\dfrac{11}{16}\times\left(\dfrac{19}{5}-\dfrac{9}{5}\right)\)
\(=\dfrac{11}{16}\times2=\dfrac{22}{16}=\dfrac{11}{8}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$\frac{18}{35}\times \frac{5}{16}-\frac{5}{16}\times \frac{2}{7}$
$=\frac{5}{16}\times (\frac{18}{35}-\frac{2}{7})$
$=\frac{5}{16}\times \frac{8}{35}=\frac{1}{14}$
![](https://rs.olm.vn/images/avt/0.png?1311)
Đề bài sai, pt này ko giải được
Đề đúng: \(\dfrac{4x^2+16}{x^2+6}=...\)
Mẫu số bên trái thừa mất số 1
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5.x - 9 = 5 + 3.x
5x - 3x = 5 + 9
2x = 14
x = 14 : 2
x = 7
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(5x + 1)² = 36/49
5x + 1 = 6/7 hoặc 5x + 1 = -6/7
*) 5x + 1 = 6/7
5x = 6/7 - 1
5x = -1/7
x = -1/7 : 5
x = -1/35
*) 5x + 1 = -6/7
5x = -6/7 - 1
5x = -13/7
x = -13/7 : 5
x = -13/35
Vậy x = -13/35; x = -1/35
--------------------
2ˣ⁻¹ = 16
2ˣ⁻¹ = 2⁴
x - 1 = 4
x = 4 + 1
x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
X - 6/5 = 4
X = 4 + 6/5
X= 26/5
X x 4/5 = 23/20
X = 23/20 : 4/5
X = 23/16
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 1415 x 5 x 5 + 16 = 1415 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141
5 x 5 x 5 + 16 = 141