[Toán 7] Hình học

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mdt1122003

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covija

x^2+10x+35
=x^2+5x+5x+35
=x^2+5x+5x+25+10
=(x^2+5x)+(5x+25)+10
=x(x+5)+5(x+5)+10
=(x+5)(x+5)+10
=(x+5)^2 +10
Do (x+5)^2 \geq 0 với \forall x
\Rightarrow (x+5)^2 +10 \geq 10 với \forall x Dễ wá
 
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