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

Toán Lớp 8: kết quả phép nhân (x+1)(5-x) là

Toán Lớp 8: kết quả phép nhân (x+1)(5-x) là

Comments ( 2 )

  1. (x + 1)(5 – x)
    = 5x + 5 – x² – x
    = 4x – x² + 5

  2. (x+1)(5-x)
    =(x+1).5-(x+1).x
    =4x-x^2+5
     

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

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