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\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
\(23\left(x-1\right)+19=65\)
\(23\left(x-1\right)=65-19\)
\(23\left(x-1\right)=46\)
\(x-1=46:23\)
\(x-1=2\)
\(x=2+1\)
\(x=3\)
\(5x+3x=88\)
\(x\left(5+3\right)=88\)
\(x.8=88\)
\(x=88:8\)
\(x=11\)
\(x^3=64\)
\(x^3=4^3\)
\(\Rightarrow x=4\)
\(\left(5x-4\right):7-2=6\)
\(\left(5x-4\right):7=6+2\)
\(\left(5x-4\right):7=8\)
\(5x-4=8.7\)
\(5x-4=56\)
\(5x=56+4\)
\(5x=60\)
\(x=60:5\)
\(x=12\)
\(x^{50}=x\)
\(\Rightarrow x=1\)
\(4.2^x-3=125\)
\(4.2^x=125+3\)
\(4.2^x=128\)
\(2^x=128:4\)
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
k mk nha
a.
\(\left|x-1\right|+3x=1\)
\(\left|x-1\right|=1-3x\)
\(x-1=\pm\left(1-3x\right)\)
- \(x-1=1-3x\)
\(x+3x=1+1\)
\(x\times\left(1+3\right)=2\)
\(4x=2\)
\(x=\frac{2}{4}\)
\(x=\frac{1}{2}\)
- \(x-1=-\left(1-3x\right)\)
\(x-1=-1+3x\)
\(x-3x=-1+1\)
\(x\times\left(1-3\right)=-1+1\)
\(-2x=0\)
\(x=0\)
Vậy x = 0 hoặc x = 1/2.
b.
\(\left|5x-3\right|-x=7\)
\(\left|5x-3\right|=7+x\)
\(5x-3=\pm\left(7+x\right)\)
- \(5x-3=7+x\)
\(5x-x=7+3\)
\(x\times\left(5-1\right)=10\)
\(4x=10\)
\(x=\frac{10}{4}\)
\(x=\frac{5}{2}\)
- \(5x-3=-\left(7+x\right)\)
\(5x-3=-7-x\)
\(5x+x=-7+3\)
\(x\times\left(1+5\right)=-4\)
\(x\times6=-4\)
\(x=-\frac{4}{6}\)
\(x=-\frac{2}{3}\)
Chúc bạn học tốt
\(2\left(x-5\right)+3\left(2-3x\right)=5x+7\)
\(\Leftrightarrow2x-10+6-9x=5x+7\)
\(\Leftrightarrow\left(2x-9x\right)+\left(6-10\right)=5x+7\)
\(\Leftrightarrow-7x-4=5x+7\)
\(\Leftrightarrow-7x-5x=4+7\)
\(\Leftrightarrow-12x=11\)
\(\Leftrightarrow x=\frac{-11}{12}\)
\(3x-5\left(x-2\right)+7=4x-12\)
\(\Leftrightarrow3x-5x-10+7=4x-12\)
\(\Leftrightarrow\left(3x-5x\right)-\left(10-7\right)=4x-12\)
\(\Leftrightarrow-2x-3=4x-12\)
\(\Leftrightarrow-2x-4x=3-12\)
\(\Leftrightarrow-6x=-15\)
\(\Leftrightarrow x=\frac{-15}{-6}=\frac{5}{2}\)
1. 6/14+3/x=y/7
3/x= y/7-6/14
3/x=2y-6/14
=> 3/x= y-3/7
=>.21=(y-3)x=7x3=3x7=-7x(-3)=-3x(-7)
=> Lập bảng
.....tự giải nốt
15(4-7)-15(5-3)
=15.3-15.2
=15.(3-2)
=15.1
=15
Xong rồi đó.Chúc bn học tốt nha
=>2x=-8
hay x=-4
\(5x-7=3x-15\\ \Rightarrow5x-7-3x+15=0\\ \Rightarrow\left(5x-3x\right)+\left(15-7\right)=0\\ \Rightarrow2x+8=0\\ \Rightarrow2x=-8\\ \Rightarrow x=-4\)