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

Toán Lớp 8: 1)64×3+48×2+12x-140=0 2)x2-6xz+z2-y2

Toán Lớp 8: 1)64×3+48×2+12x-140=0
2)x2-6xz+z2-y2

Comments ( 1 )

  1. a) 64x3 + 48x2 + 12x + 1 = 27
    ( 4x ) 3 + 3 . ( 4x ) 2 . 1 + 3 . 4x . 1 2 + 1 3 = 27
    ( 4x + 1 ) 3  = 27
    4x + 1 = 3
    4x = 2
    x = 0 , 5
    câu b) chưa đầy đủ
     

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