Tìm x€Z a)x-14=3x+18 b)2(x-5)-3(x-4)=-6+15(-3) c)(x+7)(x-9)=0 d)|2x-5|-7=22 16/07/2021 Bởi Athena Tìm x€Z a)x-14=3x+18 b)2(x-5)-3(x-4)=-6+15(-3) c)(x+7)(x-9)=0 d)|2x-5|-7=22
a)x-14=3x+18 ⇔x-3x=18+14 ⇔-2x=32 ⇔ x=-16 Vậy x=-16 b)2(x-5)-3(x-4)=-6+15(-3) ⇔2x-10-3x+12=-6-45 ⇔2x-3x=-6-45+10-12 ⇔-x=-53 ⇔x=53 Vậy x=53 c)(x+7)(x-9)=0 ⇔\(\left[ \begin{array}{l}x+7=0\\x-9=0\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=0-7\\x=0+9\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=-7\\x=9\end{array} \right.\) Vậy x=-7; x=9 d)|2x-5|=22+7 ⇔|2x-5|=29 ⇔\(\left[ \begin{array}{l}2x-5=29\\2x-5=-29\end{array} \right.\)⇔\(\left[ \begin{array}{l}2x=29+5\\2x=-29+5\end{array} \right.\)⇔\(\left[ \begin{array}{l}2x=34\\2x=-24\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=34:2\\x=-24:2\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=17\\x=-12\end{array} \right.\) Vậy x=17; x=12. Bình luận
a)x-14=3x+18
⇔x-3x=18+14
⇔-2x=32
⇔ x=-16
Vậy x=-16
b)2(x-5)-3(x-4)=-6+15(-3)
⇔2x-10-3x+12=-6-45
⇔2x-3x=-6-45+10-12
⇔-x=-53
⇔x=53
Vậy x=53
c)(x+7)(x-9)=0
⇔\(\left[ \begin{array}{l}x+7=0\\x-9=0\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=0-7\\x=0+9\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=-7\\x=9\end{array} \right.\)
Vậy x=-7; x=9
d)|2x-5|=22+7
⇔|2x-5|=29
⇔\(\left[ \begin{array}{l}2x-5=29\\2x-5=-29\end{array} \right.\)⇔\(\left[ \begin{array}{l}2x=29+5\\2x=-29+5\end{array} \right.\)⇔\(\left[ \begin{array}{l}2x=34\\2x=-24\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=34:2\\x=-24:2\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=17\\x=-12\end{array} \right.\)
Vậy x=17; x=12.
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