Toán 8 hằng đẳng thức

P

princessbexinh

tra loi ne

(x-2)^3-(x-3).(x^2+3x+9)+6(x+1)^2=15
\Leftrightarrow x^3-6x^2+12x-8-x^3+27+6x^2+12x+6=15
\Leftrightarrow 24x+25=15
\Leftrightarrow x=-5/12
 
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