$3\sqrt{x^3+8}=2(x^2-3x+2)$

Đkxđ $x\geq-2$

pt<=>$3\sqrt{(x+2)(x^{2}-2x+4)}=2(x^{2}-3x+2)$

đặt $\sqrt{x+2}=a(a\geq0),\sqrt{x^{2}-2x+4}=b(b\geq0)$

=>$b^{2}-a^{2}=x^{2}-3x+2$

khi đó pt thàh...
<=>3ab=2(b^2-a^2)<=>2a^2 3ab-b^2=0<=>(2a b)(2a-b)=0 –  honglua9a1 23-05-14 12:07 AM
v?y giai cai pt co a, b roi x nua thi giai sao ban? –  leejongsukleejongsuk 22-05-14 11:32 PM
Chi la tach x^3 8=(x 2)(x^2-2x 4).xog rui dat –  honglua9a1 22-05-14 10:12 PM
ban oi minh k hieu lam, ban trinh bay ro hon dc khg? :)) –  leejongsukleejongsuk 22-05-14 10:08 PM

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