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

Toán Lớp 8: (3x cộng 5a) mũ 2 =..

Toán Lớp 8: (3x cộng 5a) mũ 2 …………..

Comments ( 2 )

  1. (3x+5a)^2
    = (3x)^2 + 2(3x)(5a) + (5a)^2
    = 9x^2 + 30ax + 25a^2 

  2. (3x + 5a)^2 = (3x)^2 + 2. 3x. 5a + (5a)^2 = 9x^2 + 30ax + 25a^2
     

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

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