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

Toán Lớp 8: Thực hiện phép tính A,(3+x)^2 B,(5-x)^3 C,(6x^4y^2-3x^3y^3):3x^3y^2 D,(2x-1)(x^2-x+3) E,9/x^2+3x-3-x/x

Toán Lớp 8: Thực hiện phép tính
A,(3+x)^2
B,(5-x)^3
C,(6x^4y^2-3x^3y^3):3x^3y^2
D,(2x-1)(x^2-x+3)
E,9/x^2+3x-3-x/x

Comments ( 1 )

  1. a, (3 + x)²
    (x + 3)²
    (x + 3) (x + 3)
    x(x + 3) + 3(x + 3)
    x² + 3x + 3x + 9
    x² + 6x + 9
    (3 + x)²
    x² + 3x + 3x + 9
    x(x + 3) + 3(x + 3)
    (x + 3) (x + 3)
    (x + 3)²
    d, (2x – 1)(x² – x + 3)
    2x (x² – x + 3) – 1(x² – x + 3 )
    2x³ – 2x² + 6x – 1 (x² – x + 3)
    2x³ – 2x² + 6x – x² + x – 3
    2x³ – 3x² + 6x + x – 3
    2x³ – 3x² + 7x – 3
    Còn câu b,c,e mình không biết làm:(
     

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