toán nâng cao lớp 8

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wongmytu

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H

huynhbachkhoa23

(a) $3x^2-5x+3=3(x-\dfrac{5}{6})^2+\dfrac{11}{12}>0$

(b) $4x^2+4x+2=(2x+1)^2+1 >0$

(c) $4x^2+3x+2=4(x+\dfrac{3}{8})^2+\dfrac{23}{16} >0$

(d) $2x^2+3x+4=2(x+\dfrac{3}{4})^2+\dfrac{23}{8}>0$
 
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