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

Toán Lớp 8: Thực hiện phép tính a, x(x-6)+(x-3)(5-x)

Toán Lớp 8: Thực hiện phép tính
a, x(x-6)+(x-3)(5-x)

Comments ( 1 )

  1. a, x(x-6) + (x-3)(5-x)
    = x^2 – 6x + 5x – x^2 – 15 + 3x
    = (x^2 -x^2 ) + (-6x + 5x +3x) -15
    = 2x -15
     

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