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

Toán Lớp 8: Bài 1: Thực hiện phép tính 1. (x+1)(x+1)+(x+1)(x-1) 2. (x-2)(x+2)-(x+2)(x+3)

Toán Lớp 8: Bài 1: Thực hiện phép tính
1. (x+1)(x+1)+(x+1)(x-1)
2. (x-2)(x+2)-(x+2)(x+3)

Comments ( 1 )

  1. 1/=  $(x +1 )( x+1+x-1) $ 
       =  $ ( x + 1 ) ( 2x + 2 ) $
       =  $(x+1)^{2}$ . 2 $ 
    2/ = $ ( x+ 2 ) ( x-2 – x + 3 ) $
        = $ ( x + 2 ) ( 2x – 1 ) $ 

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

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