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

Toán Lớp 8: 2x. ( x – 5 ) + ( x – 2 ) . ( x + 3 ) ( 2 x – 5 ) . ( 1 – x ) – ( x – 3 ) . ( – 2x )

Toán Lớp 8: 2x. ( x – 5 ) + ( x – 2 ) . ( x + 3 )
( 2 x – 5 ) . ( 1 – x ) – ( x – 3 ) . ( – 2x )

Comments ( 2 )

  1. $\displaystyle \begin{array}{{>{\displaystyle}l}} 2x( x-5) +( x-2)( x+3)\\ =2x^{2} -10x+x^{2} +3x-2x-6\\ =3x^{2} -9x-6\\ ( 2x-5)( 1-x) -( x-3)( -2x)\\ =2x-2x^{2} -5+5x+2x^{2} -6x\\ =x-5 \end{array}$
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    2x. ( x – 5 ) + ( x – 2 ) . ( x + 3)
    = 2x² – 10x + x² + 3x – 2x – 6
    =3x² – 9x  – 6
    ( 2 x – 5 ) . ( 1 – x ) – ( x – 3 ) . ( – 2x )
    = 2x – 2x² – 5 + 5x + 2x² – 6x
    = x – 5
    @Cru gửi ạ
    Xin ctlhn ~~
     

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

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