Toán Lớp 9: Giải phương trình: x – 1/3 = x+1
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Toán Lớp 9: Giải phương trình: x – 1/3 = x+1
Comments ( 2 )
$\frac{x-1}{3}$ = x + 1
<=> x – 1 = 3x + 3
<=> x – 3x = 3 + 1
<=> -2x = 4
<=> x = -2
(x – 1)/3 = x+1(x>=1)
<=>x-1=3(x+1)
<=>x-1=3x+3
<=>x-3x=3+1
<=>-2x=4
<=>x=4:(-2)
<=>x=-2
Vậy S={-2}