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

Toán Lớp 8: a) 2x(x-3)+(x+2)(5x-4) Rút gọn

Toán Lớp 8: a) 2x(x-3)+(x+2)(5x-4) Rút gọn

Comments ( 2 )

  1. 2x(x-3)+(x+2)(5x-4)
    = 2x^2 -6x + 5x^2 – 4x + 10x – 8
    = 7x^2 – 8

  2.  Ta có: 2x(x – 3)+(x + 2)(5x – 4)
    = 2x² – 6x + 5x² – 4x + 10x – 8
    = (2x² + 5x²) +(- 6x – 4x + 10x) – 8
    = 7x² – 8
    Gửi bạn nha

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