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

Toán Lớp 8: (x+2) ² lại tìm hđt nha các bn

Toán Lớp 8: (x+2) ²
lại tìm hđt nha các bn

Comments ( 2 )

  1. (x+2) ²
    =>x² + 4x + 4
    HĐT áp dụng: (A+B)²=A² +2AB+ B²

  2. (x+2)^2
    =x^2+2.2x+2^2
    =x^2+4x+4
    áp dụng: (A+B)^2=A^2+2AB+B^2

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

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