Toán Lớp 6: Tìm x
5/7 – 3/7 . x = 0.25
17/2 – |2x-3/4|=-7/4
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Toán Lớp 6: Tìm x
5/7 – 3/7 . x = 0.25
17/2 – |2x-3/4|=-7/4
Comments ( 2 )
3/7 .x=5/7-0,25
3/7. x=5/7-1/4
3/7. x=20/28-7/28
3/7. x=13/28
x=13/28:3/7
x=13/28. 7/3
x=13/12
Vậy x=13/12
|2x-3/4|=17/2+7/4
|2x-3/4|=34/4+7/4
|2x-3/4|=41/4
|2x-0,75|=10,25
=>\(\left[ \begin{array}{l}2x-0,75=10,25\\2x-0,75=-10,25\end{array} \right.\)
=>\(\left[ \begin{array}{l}2x=10,25+0,75\\2x-0,75=-10,25+0,75\end{array} \right.\)
=>\(\left[ \begin{array}{l}2x=11\\2x=-9,5\end{array} \right.\)
=> \(\left[ \begin{array}{l}x=11:2\\x=-9,5:2\end{array} \right.\)
=>\(\left[ \begin{array}{l}x=5,5\\x=-4,75\end{array} \right.\)
Vậy x in{5,5;-4,75}