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

Toán Lớp 8: Thực hiện phép tính (a+2)^2-(a+2)(a-2)

Toán Lớp 8: Thực hiện phép tính
(a+2)^2-(a+2)(a-2)

Comments ( 2 )

  1. (a+2)^2-(a+2).(a-2)
    =a^2+4a+4-(a^2-4)
    =a^2+4a+4-a^2+4
    =4a+8

    toan-lop-8-thuc-hien-phep-tinh-a-2-2-a-2-a-2

  2. (a+2)^2-(a+2)(a-2)
    =a^2+4a+4-a^2+4
    =4a+8
     

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

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