a, \(\dfrac{3}{4}-\dfrac{1}{2}x=-\dfrac{1}{4}\)

=>\(-\dfrac{1}{2}x=-\dfrac{1}{4}-\dfrac{3}{4}\)

=>\(-\dfrac{1}{2}x=-1\)

=>\(x=-1:(-\dfrac{1}{2})\)

=>\(x=2\)

vậy ...........

b,\(1\dfrac{2}{3}x+0,2=x-\dfrac{7}{8}\)

=>\(\dfrac{5}{3}x+0,2=x-\dfrac{7}{8}\)

=>\(\dfrac{5}{3}x-x=-\dfrac{7}{8}-0,2\)

=>\(\dfrac{2}{3}x=-\dfrac{43}{40}\)

=>\(x=-\dfrac{43}{40}:\dfrac{2}{3}\)

=>\(x=-\dfrac{192}{80}\)

vậy...................

c,\(\dfrac{3}{4}-\left|x+0,5\right|=\dfrac{1}{5}\)

=>\(-\left|x+0,5\right|=\dfrac{1}{5}-\dfrac{3}{4}\)

=>\(-\left|x+0,5\right|=-\dfrac{11}{20}\)

=>\(\left|x+0,5\right|=\dfrac{11}{20}\)

=>\(\left[{}\begin{matrix}x+0.5=\dfrac{11}{20}\\x+0,5=-\dfrac{11}{20}\end{matrix}\right.\)

=>\(\left[{}\begin{matrix}x=\dfrac{1}{20}\\x=-\dfrac{21}{20}\end{matrix}\right.\)

vậy ....... hoặc.....

d,\((x+0,2)^2+0,75=1\)

=>\(\left(x+0,2\right)^2=1-0,75\)

=>\(\left(x+0,2\right)^2=0,25\)

=>\(\left[{}\begin{matrix}x+0,2=0,5\\x+0,2=-0,5\end{matrix}\right.\)

=>\(\left[{}\begin{matrix}x=0,3\\x=-0,7\end{matrix}\right.\)

vậy..........................

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k đẹp = mik . Đây ms gọi là vẽ nè Câu hỏi của Silver bullet (phong) - Mỹ thuật lớp 9 | Học trực tuyến

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