Toán Lớp 7: 3/4+x=-2/3-2x help nhanh nha mn
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Toán Lớp 7: 3/4+x=-2/3-2x help nhanh nha mn
Comments ( 2 )
$\dfrac{3}{4+x}=\dfrac{-2}{3-2x}$
$⇒9-6x=-8-2x$
$⇒9-6x-9=-8-2x-9$
$⇒-6x=-2x-17$
$⇒-6x+2x=-2x-17+2x$
$⇒-4x=-17$
$⇒x=\dfrac{17}{4}$
Vậy $x=\dfrac{17}{4}$
Giải đáp:
TH1 : 3/4 + x = -2/3 – 2x
-> 3/4 + 2/3 = -x – 2x
-> 17/12 = -3x
-> x = 17/12 : (-3)
-> x = -17/36
Vậy x = -17/36
TH2 : 3/(4+x) = -2/(3-2x)
-> -2(4+x) = 3(3-2x)
-> -8 – 2x = 9 – 6x
-> 6x – 2x = 9 + 8
-> 4x = 17
-> x = 17/4
Vậy x = 17/4