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

Toán Lớp 8: rút gọn biểu thức sau (4x-3)(x-5)-2x(2x-11)

Toán Lớp 8: rút gọn biểu thức sau
(4x-3)(x-5)-2x(2x-11)

Comments ( 2 )

  1. (4x-3)(x-5)-2x(2x-11)
    =4x^2-20x-3x+15-4x^2+22x
    =(4x^2-4x^2)+(-20x-3x+22x)+15
    =-x+15
     

  2. (4x -3)(x-5) – 2x(2x-11)
    = 4x^2 – 20x – 3x + 15 – 4x^2 + 22x
    = (4x^2 – 4x^2 ) + (-20x – 3x +22x) +15
    = -x +15
     

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