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hong nguyen
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2022-12-15 19:21:59
a/ 3(x+2)-2=10
⇔ 3(x+2)=12
⇔x+2=4
⇔x=2
b/ x2-5x+6=0
⇔x2-3x-2x+6=0
⇔(x-2)(x-3)=0
⇔x-2=0 hoặc x-3=0
⇔x=2 hoặc x=3