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

Toán Lớp 8: chứng minh ( A + B )^2 = A^2 + 2AB + B^2 HELP ai xong trước cho hay nhất

Toán Lớp 8: chứng minh ( A + B )^2 = A^2 + 2AB + B^2
HELP
ai xong trước cho hay nhất

Comments ( 2 )

  1. ( A + B )^2
    = ( A + B ) ( A + B )
    = $A^{2}$ + AB + AB + $B^{2}$ 
    = $A^{2}$ + 2AB + $B^{2}$

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

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