Tìm X biết
-4,6x - 1,53 - 5,4x=8,47
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\(5,4x^2-36=0\\ \Leftrightarrow\left(2x\right)^2-6^2=0\\ \Leftrightarrow\left(2x-6\right)\left(2x+6\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-6=0\\2x+6=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)
Vậy \(S=\left\{3;-3\right\}\)
\(7,\left(3x+1\right)^2-16=0\\ \Leftrightarrow\left(3x+1\right)^2-4^2=0\\ \Leftrightarrow\left(3x+1-4\right)\left(3x+1+4\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}3x-3=0\\3x+5=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-\dfrac{5}{3}\end{matrix}\right.\)
Vậy \(S=\left\{1;-\dfrac{5}{3}\right\}\)
\(8,\left(2x-3\right)^2-49=0\\ \Leftrightarrow\left(2x-3\right)^2-7^2=0\\ \Leftrightarrow\left(2x-3-7\right)\left(2x-3+7\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-10=0\\2x+4=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-2\end{matrix}\right.\)
Vậy \(S=\left\{-2;5\right\}\)
\(\left(-3x+0.2\right)^{16}=\left(5.4x-1.3\right)^{16}\Rightarrow-3x+0.2=5.4x-1.3\Rightarrow\)
\(\Rightarrow-3x-5.4x=-0.2-1.3\Rightarrow-8x=-1.5\Rightarrow x=\frac{-1.5}{-8}=\frac{3}{16}\)
Sorry mik sai ở chổ này \(\Rightarrow-8.4x=-1.5\Rightarrow x=\frac{-1.5}{-8.4}=\frac{5}{28}\)
1,53 . 82 + 8,2 . 15,3 + 1,53 . 22 - 1,53 . 86
1,53 . 82 + 8,2 . 15,3 + 1,53 . 22 - 1,53 . 86
1,53 . 82 + 8,2 . 15,3 + 1,53 . 22 - 1,53 . 86
1,53 . 82 + 8,2 . 15,3 + 1,53 . 22 - 1,53 . 86
= 153
x : 4,37 = 5,6 ( dư 1,53 )
x = 5,6 x 4,37 + 1,53
x = 24,472 + 1,53
x = 26,002
x : 4,37 = 5,6 ( dư 1,53 )
x = 5,6 . 4,37 + 1,53
x = 26,002
\(1,53.72+1,53.52+1,53.22-1,53.46\)
\(=1,53.\left(72+52+22-46\right)\)
\(=1,53.100\)
\(=153\)
_Chúc bạn học tốt_
1,53 x (72+22-46)+15,3 x 52=1,53 x 48 + 15,3 x 52 = 73,44 + 795,6= 869,04
sai đề bài à , nếu ko sai thì KQ như trên nha
a ) 3,71 × 65 + 3,71 × 25 + 10 × 3,71
=\(3,17X\left(65+25+10\right)\)
=\(3,17X100\)
=\(317\)
\(\left(-4,6\right)x-1,53-5,4x=8,47\)
\(\Rightarrow\left(-4,6\right)x-5,4x-1,53=8,47\)
\(\Rightarrow x\left[\left(-4,6\right)-5,4\right]=8,47+1,53\)
\(\Rightarrow x.\left(-10\right)=10\)
\(\Rightarrow x=10:\left(-10\right)\)
\(\Rightarrow x=-1\)
Vậy \(x=-1\)
\(-4.6x-1.53-5.4x=8.47\\ \Leftrightarrow\left(-4.6x-5.4x\right)-1.53=8.47\\ \Leftrightarrow-10x=8.47+1.53\\ \Leftrightarrow-10x=10\\ \Leftrightarrow x=-1\)
Vậy \(x=-1\)