Toán Lớp 8: 3x-1/x-1-2x+5/x+3=1-4/(x-1)(x+3)
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Toán Lớp 8: 3x-1/x-1-2x+5/x+3=1-4/(x-1)(x+3)
Comments ( 2 )
<=>((3x-1)(x+3))/((x-1)(x+3))-((2x+5)(x-1))/((x-1)(x+3))=((x-1)(x+3))/((x-1)(x+3))-4/((x-1)(x+3)<=>(3x-1)(x+3)-(2x+5)(x-1)=(x-1)(x+3)-4
<=>3x^2+8x-3-2x^2-3x+5=x^2+2x-3-4
<=>3x^2-2x^2-x^2+8x-3x-2x-3+5+3+4=0
<=>3x+9=0
<=>3x=-9
<=>x=-3 (Ktmđk)
Vậy : Phương trình vô nghiệm