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

Toán Lớp 8: Rút gọn: `7x + 5x^2 + 5x (2 – x)`

Toán Lớp 8: Rút gọn: 7x + 5x^2 + 5x (2 – x)

Comments ( 2 )

  1. 7x + 5x^2 + 5x ( 2 – x )
    = 7x + 5x^2 + 5x . 2 + 5x . ( – x )
    = 7x + 5x^2 + 10x – 5x^2
    = ( 5x^2 – 5x^2 ) + ( 7x + 10x )
    = 0 + 17x
    = 17x

  2. Giải đáp+Lời giải và giải thích chi tiết:
     7x+5x^2+5x(2-x)
    =7x+5x^2+5x.2+5x.(-x)
    =7x+5x^2+10x-5x^2
    =17x

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

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