Toán Lớp 8: 12x(12x – 1)(12 + 5)(12x – 5)=12x +25
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Toán Lớp 8: 12x(12x – 1)(12 + 5)(12x – 5)=12x +25
Tìm x
Comments ( 2 )
Giải thích các bước giải:
12x(12x−1)×17(12x−5)=12x+25
⇔204x(12x−1)(12x−5)=12x+25
⇔29376x³−12240x²−2448x²+1020x=12x+25
⇔29376x³−14688x²+1020x=12x+25
⇔29376x³−14688x²+1020x−12x−25=0
⇔29376x³−14688x²+1008x−25=0
⇒x=0,423766