CMR các pt sau có 2 nghiệm pb
a, m(x-1)(x-2)+2xx-3=0
b, m($x^2$-9)+x(x-5)=0
dầu tiên biện luận m=0 thì pt có 2 nghiệm pb, sau đó e nhân tung tóe ra rồi tính delta. cho delta>0. kết hợp 2 đk trên là xog. –  Bùi Cao Thắng 22-02-16 08:16 PM
nhân hết ra rùi rút gọc ta dc : $mx^{2}-3mx+2m+2x^{2}-3=0$
        $\left ( m+2 \right )x^{2}-3mx+2m-3=0$
          để pt là bậc 2 thì $m+2\neq 0=>m\neq -2$
tính denlta dc: $\left ( -3m\right )^{2}-4(m+2)(2m-3)=m^{2}-4m+24=\left ( m-2 \right )^{2}+20\geq 0$
Vậy pt đã cho có 2 nghiệm pb 

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