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

Toán Lớp 8: (x-1)^2 – (x-2)^2 Rút gọn biểu thức

Toán Lớp 8: (x-1)^2 – (x-2)^2
Rút gọn biểu thức

Comments ( 2 )

  1. text{#Orca}
    (x – 1)^2 – (x – 2)^2 
    = (x – 1 – x + 2)(x – 1 + x – 2)
    = 2x – 3
     

  2.    ( x – 1 )^2 – ( x – 2 )^2
    = ( x – 1 – x + 2 )( x – 1 + x – 2 )
    = 1.( 2x – 3 )
    = 2x – 3
     

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

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