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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: 3x²+10x+3x=0 x³—4x²+3x=0 2x³—7x²+3x=0 x³—3x²—4x=0 2x³—6x²+x=0

Toán Lớp 8: 3x²+10x+3x=0
x³—4x²+3x=0
2x³—7x²+3x=0
x³—3x²—4x=0
2x³—6x²+x=0

Comments ( 2 )

  1. 3x²+10x+3x=0
    ⇔3x²+13x=0
    ⇔x(3x+13)=0
    ⇔x=0 hoặc x=-(13)/3
    x³-4x²+3x=0
    ⇔x³-x²-3x²+3x=0
    ⇔x²(x-1)-3x(x-1)=0
    ⇔(x-1)(x²-3x)=0
    ⇔(x-1)[x(x-3)]=0
    ⇔(x-1)x(x-3)=0
    ⇔x=1 hoặc x=0 hoặc x=3
    2x³-7x²+3x=0
    ⇔2x³-x²-6x²+3x=0
    ⇔x²(2x-1)-3x(2x-1)=0
    ⇔(2x-1)(x²-3x)=0
    ⇔(2x-1)x(x-3)=0
    ⇔x=1/2 hoặc x=0 hoặc x=3
    x³-3x²-4x=0
    ⇔(x-4)(x+1)=0
    ⇔x=4 hoặc x=-1
    2x³-6x²+x=0
    ⇔x(2x-3-√7)(2x-3+√7)=0
    ⇔x=0 hoặc x=(3+√7)/2 hoặc x=(3-√7)/2
     

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222-9+11+12:2*14+14 = ? ( )

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