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![](https://rs.olm.vn/images/avt/0.png?1311)
(-3/4)63x-1=(3/4)^3
3x-1=3+1
3x=3=1
x=4;3
x=4/3
Vậy x=4/3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\left(\frac{3}{8}+-\frac{3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
= \(\left(-\frac{3}{8}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
= \(\frac{5}{24}:\frac{5}{6}+\frac{1}{2}\)
= \(\frac{1}{4}+\frac{1}{2}\)
= \(\frac{3}{4}\)
b)\(-\frac{7}{3}.\frac{5}{9}+\frac{4}{9}.\left(-\frac{3}{7}\right)+\frac{17}{7}\)
=\(-\frac{35}{27}+\left(-\frac{4}{21}\right)+\frac{17}{7}\)
= \(-\frac{35}{27}+\frac{47}{21}\)
= \(\frac{178}{189}\)
c) \(\frac{117}{13}-\left(\frac{2}{5}+\frac{57}{13}\right)\)
= \(\frac{117}{13}-\frac{311}{65}\)
= \(\frac{274}{65}\)
d) \(\frac{2}{3}-0,25:\frac{3}{4}+\frac{5}{8}.4\)
= \(\frac{2}{3}-\frac{1}{4}:\frac{3}{4}+\frac{5}{8}.4\)
= \(\frac{2}{3}-\frac{1}{3}+\frac{5}{2}\)
= \(\frac{1}{3}+\frac{5}{2}\)
= \(\frac{17}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>2x-1=4 hoặc 2x-1=-4
=>2x=5 hoặc 2x=-3
=>x=5/2 hoặc x=-3/2
d: =>x=|2|=2
e: \(\Leftrightarrow\left\{{}\begin{matrix}x-1=0\\x-y=0\end{matrix}\right.\Rightarrow x=y=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \((\frac{3}{7}-\frac{2}{3})\) .x =\(\frac{10}{21}\)
\(\frac{-5}{21}\).x=\(\frac{10}{21}\)
x= -2
Mk chỉ làm 1 phần các phằn còn lại tương tự
bài 1:
\(\left(\dfrac{3}{7}+\dfrac{1}{2}\right)^2=\left(\dfrac{6}{14}+\dfrac{7}{14}\right)^2=\left(\dfrac{13}{14}\right)^2=\dfrac{169}{196}\)
\(\left(\dfrac{3}{4}-\dfrac{5}{6}\right)^2=\left(\dfrac{9}{12}-\dfrac{10}{12}\right)^2=\left(-\dfrac{1}{12}\right)^2=\dfrac{1}{144}\)
\(\dfrac{5^4\cdot20^4}{25^5\cdot45}=\dfrac{5^4\cdot5^4\cdot\left(2^2\right)^4}{\left(5^2\right)^5\cdot5\cdot3^2}=\dfrac{5^8\cdot2^8}{5^{12}\cdot3^2}=\dfrac{1}{5^4}\cdot\dfrac{2^8}{3^2}=\dfrac{256}{5625}\)
Bài 2:
a: \(\left(x-1\right)^3=27\)
=>\(\left(x-1\right)^3=3^3\)
=>x-1=3
=>x=3+1=4
b: \(x^2+x=0\)
=>x(x+1)=0
=>\(\left[{}\begin{matrix}x=0\\x+1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\)
c: \(\left(2x+1\right)^2=25\)
=>\(\left[{}\begin{matrix}2x+1=5\\2x+1=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=4\\2x=-6\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)
d: \(\left(2x-1\right)^3=64\)
=>\(\left(2x-1\right)^3=4^3\)
=>2x-1=4
=>2x=4+1=5
=>\(x=\dfrac{5}{2}\)
1.Tính:
(3/7 + 1/2)^2:
(3/4 - 5/6)^2:
54 x 204 / 255 x 45:
Kết quả:
a. (x - 1)^3 = 27
b. x^2 + x = 0
c. (2x + 1)^2 = 25
d. (2x - 1)^3 = 64
Kết quả:
a. x = 4 b. x = 0 hoặc x = -1 c. x = 2 hoặc x = -3 d. x = 5/2