a, 2/3x+5/7=3/10 b, -21x+1/3=-2/3 c, /x-1,5/=2 d, /x+3/4/-1/2=0 29/10/2021 Bởi Daisy a, 2/3x+5/7=3/10 b, -21x+1/3=-2/3 c, /x-1,5/=2 d, /x+3/4/-1/2=0
Giải thích các bước giải: $a)\dfrac{2}{3}x+\dfrac{5}{7}=\dfrac{3}{10}$ $\dfrac{2}{3}x=\dfrac{-29}{70}$ $x=\dfrac{-87}{140}$ $b)-21x+\dfrac{1}{3}=-\dfrac{2}{3}$ $-21x=-1$ $x=\dfrac{1}{21}$ $c)|x-1,5|=2$ $<=>$\(\left[ \begin{array}{l}x-1,5=2\\x-1,5=-2\end{array} \right.\) $<=>$\(\left[ \begin{array}{l}x=3,5\\x=-0,5\end{array} \right.\) $d)|x+\dfrac{3}{4}|-\dfrac{1}{2}=0$ $|x+\dfrac{3}{4}|=\dfrac{1}{2}$ $<=>$\(\left[ \begin{array}{l}x+\dfrac{3}{4}=\dfrac{1}{2}\\x+\dfrac{3}{4}=-\dfrac{1}{2}\end{array} \right.\) $<=>$\(\left[ \begin{array}{l}x=-\dfrac14\\x=-\dfrac54\end{array} \right.\) Bình luận
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Giải thích các bước giải:
$a)\dfrac{2}{3}x+\dfrac{5}{7}=\dfrac{3}{10}$
$\dfrac{2}{3}x=\dfrac{-29}{70}$
$x=\dfrac{-87}{140}$
$b)-21x+\dfrac{1}{3}=-\dfrac{2}{3}$
$-21x=-1$
$x=\dfrac{1}{21}$
$c)|x-1,5|=2$
$<=>$\(\left[ \begin{array}{l}x-1,5=2\\x-1,5=-2\end{array} \right.\) $<=>$\(\left[ \begin{array}{l}x=3,5\\x=-0,5\end{array} \right.\)
$d)|x+\dfrac{3}{4}|-\dfrac{1}{2}=0$
$|x+\dfrac{3}{4}|=\dfrac{1}{2}$
$<=>$\(\left[ \begin{array}{l}x+\dfrac{3}{4}=\dfrac{1}{2}\\x+\dfrac{3}{4}=-\dfrac{1}{2}\end{array} \right.\) $<=>$\(\left[ \begin{array}{l}x=-\dfrac14\\x=-\dfrac54\end{array} \right.\)