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Toán Lớp 7: Tìm x biết : a) Ix+1/3I=0 b) IxI-3/5=5/9 c) Ix+3/4I=1/2 d) I5/18-xI-7/24=0

Home/ Toán Lớp 7: Tìm x biết : a) Ix+1/3I=0 b) IxI-3/5=5/9 c) Ix+3/4I=1/2 d) I5/18-xI-7/24=0

Toán Lớp 7: Tìm x biết : a) Ix+1/3I=0 b) IxI-3/5=5/9 c) Ix+3/4I=1/2 d) I5/18-xI-7/24=0

Nhân Tháng Sáu 26, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: Tìm x biết :
a) Ix+1/3I=0
b) IxI-3/5=5/9
c) Ix+3/4I=1/2
d) I5/18-xI-7/24=0

Comments ( 1 )

chauhoangmy98
26 Tháng Sáu, 2022 at 1:48 chiều

Reply

Giải đáp:

$.$

Lời giải và giải thích chi tiết:

$a)\,\left|x+\dfrac13\right|=0\\\Rightarrow x+\dfrac13=0\\\Rightarrow x=\dfrac{-1}{3}\\b)\,|x|-\dfrac35=\dfrac59\\\Rightarrow |x|=\dfrac{52}{45}\\\Rightarrow x=\pm\dfrac{52}{45}\\c)\,\left|x+\dfrac34\right|=\dfrac12\\\Rightarrow\left\{\begin{matrix}x+\dfrac34=\dfrac12\Rightarrow x=\dfrac{-1}4\\x+\dfrac34=\dfrac{-1}{2}\Rightarrow x=\dfrac{-5}4\end{matrix}\right.\\d)\,\left|\dfrac{5}{18}-x\right|-\dfrac{7}{24}=0\\\Rightarrow \left|\dfrac{5}{18}-x\right|=\dfrac{7}{24}\\\Rightarrow\left\{\begin{matrix}\dfrac{5}{18}-x=\dfrac{7}{24}\Rightarrow x=\dfrac{-1}{72}\\\dfrac{5}{18}-x=\dfrac{-7}{24}\Rightarrow x=\dfrac{41}{72}\end{matrix}\right.$

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