Toán Lớp 8: 1 (3x-1)^2-(3x+2)(3x-2)=0
2 (2x+5)^2-(x-1)(x+1)-3x^2=0 (Giup em voi )
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Toán Lớp 8: 1 (3x-1)^2-(3x+2)(3x-2)=0
2 (2x+5)^2-(x-1)(x+1)-3x^2=0 (Giup em voi )
Comments ( 2 )
<=>9x^2+1-6x-(9x^2-4)=0
<=>9x^2+1-6x-9x^2+4=0
<=>9x^2-6x-9x^2=-1-4
<=>-6x=-5
<=>x=5/6
Vậy S={5/6}
<=>4x^2+25+20x-(x^2-1)-3x^2=0
<=>4x^2+25+20x-x^2+1-3x^2=0
<=>4x^2+20x-x^2-3x^2=-25-1
<=>20x=-26
<=>x=-13/10
Vậy S={-13/10}